RealGM

Just checked the NET PER's thru the Knick Game.
(NET PER is Your PER minus Your Man's PER, factors in defense)

Basically, the Celtics, as a team, are awesome,
except center.
If they could plug the whole in the middle,
a championship would literally be a lock.
The other deficiency is that other than Ray, Paul, KG and Eddie;
there isn't another shooter in the list.

207 Players out of 425 are ranked (35% of Total Team Minutes)

+10.3 Kevin Garnett (11 in NBA)
+08.0 Ray Allen (17 in NBA)
+06.5 Paul Pierce (29 in NBA)
+05.9 Rajon Rondo (35 in NBA)

+04.8 Tony Allen (easily best individual defensive rating of any Celtic)
+02.5 Eddie House (70 in NBA)
+01.2 Leon Powe

-02.0 Kendrick Perkins (147 in NBA)
-04.9 Gabe Pruitt
-05.6 Bill Walker

-07.1 Glenn Davis
-10.9 Patrick O'Bryant
-12.0 Brian Scalabrine
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For Comparison,

Spurs
+11.4 Manu Ginoboli (7 in NBA)
+11.0 Tim Duncan (9 in NBA)
+06.5 Tony Parker (28 in NBA)
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Lakers
+13.7 Kobe Bryant (5 in NBA)
+07.2 Pau Gasol (24 in NBA)
+06.7 Andrew Bynum (25 in NBA)
+04.4 Trevor Ariza (48 in NBA)
+02.3 Lamar Odom (73 in NBA)

-01.0 Sasha Vujacic
-02.5 Luke Walton
-03.2 Jordan Farmar
-04.5 Derek Fisher (177 in NBA)
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Cleveland
+24.6 LeBron James (1 in NBA)
+09.7 Zydrunas Illgauskas (12 in NBA)
+03.8 Delonte West (53 in NBA)
+03.8 Wally Szczerbiak (54 in NBA)
+00.8 Mo Williams (96 in NBA)
+00.4 Ben Wallace (100 in NBA)

-00.4 Anderson Varejo (118 in NBA)
-02.0 JJ Hickson
-05.1 Daniel Gibson (183 in NBA)