Let's take a look at his year-by-year career.
Early days1960: Rookie year. This year is villified by many for his efficiency, and admittedly it's not as pretty as it'll be later on, but consider this... He comes onto a team with a terribly inefficient Guy Rodgers, Tom Gola and an aging Paul Arizin as his only decent team-mates. There was NO spacing on that team, and the lane was still narrow. Wilt used to get SWARMED. The team was a -2.3 SRS team the year before, it was +2.8 when Wilt arrived. He turned the second worst team in the league to the second best. His defense was great that year, he was blocking 15 shots a game according to stories. Won the MVP over a prime Russell. Honestly, don't see how this isn't the second best rookie season ever after Kareem. Start of a legendary career.
1961: One of his weaker years. His efficiency from the field improves, gets to work on that fadeaway jumper (which people love to hate on, but it LED THE LEAGUE in FG%, so I guess it worked at the time). Arizin is even older, a rookie Al Attles doesn't help TOO much... But Wilt still gets them to the Playoffs, puts up a 37/23, but his supporting cast flops BADLY. Arizin, Gola and Rodgers combined to shoot 31% from the field. Warriors get swept by the Royals. Can't blame Wilt here, his team stunk it up.
1962: The first glimpse of prime Wilt. Sets all time scoring and rebounding records, absolutely carried a worsening cast. Rodgers was completely awful as an offensive player now, shot 35.6% from the field. All his help is Arizin and Gola. Still no real shooting on the team. Wilt is great on both ends of the court, somehow makes them the second best team in the league, and comes one Sam Jones jumper away from upsetting the greatest dynasty in sports. AGREED Russ did a good job on him in the EDF, but really, if that jumper had missed, Wilt would be hailed as the 33/25 hero who single-handedly defeated the ultimate dynasty. Since he lost, people vilify this year for his scoring dropping somewhat AGAINST THE GOAT DEFENDER. Not saying this year was perfect but it really doesn't get the credit it deserves.
1963: His team dropped off a good bit, but seriously... We're talking a team with no shooting, no defense, had Arizin retire, Gola miss 60 games, and Wilt still has the team make league average offense AND defense? With that kind of supporting cast, blame the guy who goes 45/25, leads the league in FG% and anchors the defense? Where is the logic here?
I'm going to go on a bit of a rant here but this is where standards are shifted for Wilt. In 2006 and 2007 people make all kinds of excuses for KG regarding his supporting cast and multiple problems he faced. Yet he NEVER had this kind of situation. This would be the equivalent of the 2015 Heat having Bosh leave, Wade miss 60 games, and then expect LeBron to match his previous season's results. Wilt was depending on Guy Rodgers, who was shooting 38.7% from the field, to be his second option. It is bull to blame Wilt for this season's results, given all he did. This was probably his second best pre-prime year. You can put Russell, Kareem, anyone on that team and the results do not get better. He had one of the worst supporting casts in history.
Prime Wilt1964: GOAT-level year. This was possibly Wilt at his best. His scoring drops a little bit but the efficiency goes up, and he becomes the consensus second best defender after Russ. The Warriors were a -6 defensive team, the second best mark of the era by any team besides the Russell Celtics (and the same mark people were going gaga over for the Pacers earlier this season). Wilt also becomes a part-time high post facilitator, finishing 6th in the league in assists. He ups his efficiency in the Playoffs, and makes his first Finals, losing to the GOAT defensive team. This is legendary stuff. The load he carried on both ends was ridiculous. His defense this year consistently gets underestimated. He was like a combination of Russell and Shaq, this was domination on another level. 35 ppg on 55% FG in the Playoffs, playing Russell? In that era? My God.
1965: He drops off a bit due to the heart disease. Bad team results in the beginning of the year. If you want to hold that against him, fine. He gets traded to Philly because the SFW management is full of asses. Philly immediately improves, they go 11-3 in the first 14 games with Wilt. Then Greer, Costello and Jackson all get injured in the second half of the season. Wilt still drags them to .500 and then outplays Russ in the EDF, losing because HAVLICEK STOLE THE BALL. This is the second time that one play has decided whether or not Wilt beats Russell.
1966: Start of peak Wilt. He takes his efficiency to a new level... 54% from the field on 25 FGA/game. Continues helping out with playmaking from the high post. He is now the undoubted best player in the league, taking the conch from Russell. The Sixers go 55-25. Wilt has a good supporting cast now but it's not THAT good. Greer was great, the perfect second option for Wilt. Walker was a nice do-it-all guy, but neither of them were particularly efficient. Billy C was too young to be a huge factor, Dolph Schayes refused to give Jackson the mpg he needed to make an impact, and Wali Jones was basically a better defensive version of Guy Rodgers, but even more inefficient. The results were still great though, given what he had. The first of 3 straight MVPs. 30/30 in the Playoffs, and only loses to Boston because his two best team-mates, Greer and Walker, screw up badly, shooting 36% from the floor combined. Shades of what happened with Gola and Arizin in '61. Keep this in mind when talking about his supporting cast this year. Again, GOAT level stuff.
1967: The greatest season anyone has ever played, at the very least in the top 3 with Jordan and Shaq. Sets a FG% record, becomes the first real point-center, is the keynote of Hannum's percusor to the triangle offense, and leads the Sixers to a record 68-13. I don't know how much I need to say about this year, but I'll let you guys take a look at his game-log from the Playoffs:
1967 EDSF vs. Royals
G1 - 41 points, 23 rebounds, 5 assists, 63% FG
G2 - 37 points, 27 rebounds, 11 assists, 67% FG
G3 - 16 points, 30 rebounds, 19 assists, 62% FG
G4 - 18 points, 27 rebounds, 9 assists, 50% FG
Series Average: 28.0 ppg, 26.8 rpg, 11 apg, 61% FG
Oscar Robertson: 24.8 ppg, 4.0 rpg, 11.3 apg, 51.6% FG
He had as many assists as Oscar and killed him everywhere else!
1967 EDF vs. Celtics
G1 - 24 points, 32 rebounds, 12 assists, 12 blocks, 69% FG
G2 - 15 points, 29 rebounds, 5 assists, 5 blocks, 45% FG
G3 - 20 points, 41 rebounds, 9 assists, 5 blocks, 57% FG
G4 - 20 points, 22 rebounds, 10 assists, at least 3 blocks, 44% FG
G5 - 29 points, 36 rebounds, 13 assists, 7 blocks, 63% FG
Series Average: 21.6 ppg, 32.0 rpg, 10.0 apg, 6+ bpg, 56% FG
Bill Russell: 11.4 ppg, 23.4 rpg, 6.0 apg, 36% FG
1967 NBA Finals vs. Warriors
G1 - 16 points, 33 rebounds, 10 assists, 75% FG (including a game-saving block on Nate)
G2 - 10 points, 38 rebounds (26 in 1st half), 10 assists, 10 blocks, 40% FG
G3 - 26 points, 26 rebounds, 5 assists, 52% FG
G4 - 10 points, 27 rebounds, 8 assists, 11 blocks, 50% FG
G5 - 20 points, 24 rebounds, 4 assists, 60% FG
G6 - 24 points, 23 rebounds, 4 assists, 62% FG
Series Average: 17.6 ppg, 28.5 rpg, 6.8 apg, 56% FG
Nate Thurmond: 14.1 ppg, 26.6 rpg, 3.3 apg, 34% FG
That year, Wilt was fifth in scoring, first in rebounds, third in assists, and first in FG%. He was probably first or second in blocks too. How many players can achieve that level of statistical domination on an ELITE team?
He would get the rebound, either throw an outlet or let Greer bring it up before he got the entry pass at the high post again. Facing the basket, he then hit cutters, used a handoff to a guard to set a screen or either posted up to devastating effect (68% from the field!!!). Wilt was ungodly that year, there has never been anyone as good at basketball as Wilt was in 1967.
1968: Pretty much more of the same. His efficiency from the field dropped to "only" 60%, but for the first time, toppled Russell's Celtics for the best defense in the league.
This was the only time in the 60s Russ didn't anchor the league's best defense. So Wilt was the only guy to beat Russell in the Playoffs, as well as the only guy to have a better defense than him.
In the Playoffs, he dragged an injury ridden team past the Knicks, leading both teams in every major statistical category. He lost a game 7 to Boston by 4 points, in a game where Hannum had his only real failing as a coach. He simply couldn't devise a game-plan to get the ball to Wilt with Embry and Russell swarming him. The series was still so close despite the litany of injuries the Sixers had. Billy C was out of the series, Wilt had a bad calf problem, practically the whole starting 5 was hobbled.
Wilt has an unfair reputation as a 'big-game choker'. Take a look here at his performance in swing games, elimination games and game 7s through the years:
Wilt in do or die games...
1960 G3 vs. Nationals: 53 points, ? rebounds (playoff record at the time for pts)
1962 G5 vs. Nationals: 56 pts, 35 rebs (breaks his own playoff record)
1962 G7 vs Celtics : 22 pts, 21 rebs (7/14 shooting - Warriors were on the verge of pulling off this upset but Sam James hit a clutch shot. Wilt was undoubtedly fronted by the entire Celtics frontline, as was the case for most of his games vs. Celtics in mid-60s, a defensive strategy which would have been illegal in 80s/90s mind you)
1964 G7 vs. Hawks: 39 pts, 26 rebs, 12 blocks (many of which led to 14-0 run…and scored 50 pts a couple of days earlier in the pivotal game 5)
1965 G7 vs. Celtics: 30 pts, 32 rebs (famous game where Havlichek stole the ball, had 30/26 to save team from elimination the game before)
1968 G7 vs Celtics: 14 pts, 34 rebs, (wilt’s role different, but he definitely could have stepped up offensively in the second half)
1969 G7 vs. Celtics: 18 pts, 27 rebs (injured in final 6 minutes of game, attempted to come back, coach held him back...and Lakers end up losing close game on a lucky shot by Don Nelson)
1970 G7 vs. Suns: 30 pts, 27 rebs, 11 blocks (Lakers come back from down 3-1, and Wilt was 34 at the time)
1970 G7 vs. Knicks: 21 pts, 24 rebs (45 pts 27 rebs in the game before this to save Lakers from elimination, and AGAIN, he is 34 years old)
He has the highest FG% in game 7s of anyone: .626. Second highest rebounding rate of anyone (besides Russ) in game 7s. So the myth that Wilt is a big-game player really needs to be gotten rid of.