The annotations surrounding the quotes are mine.
Ramona Shelburne | ESPN
ALTHOUGH MAGIC IS said to be personally fond of Kupchak, who joined the Lakers' front office in 1986, about halfway through Magic's playing career, he's also determined to make an honest evaluation of the general manager's performance and abilities in today's NBA.
Said one player agent, who has dealt with Kupchak on several contracts, "He's the only GM in the league who won't engage at all before 9:01 p.m. [PT] on the first night of free agency. Then when he calls to express interest, there's no stickiness to it."
Ok, agents **** on the Lakers is nothing new and you could excuse Mitch for being the only GM who plays by the rules in what is like wild west on free agency day.
Ew...
According to sources, Kupchak was reluctant to allow Mozgov to be tempted by other offers, giving him a four-year, $64 million deal just minutes after free agency began. Deng heard offers from other teams, but sources indicated he had no other offers that extended beyond three seasons. The Lakers gave him four years and $72 million.
Particularly damning:
Luol Deng's signing was underwhelming for most Lakers fans -- and some staff
I was making some peace with these signings assuming that Luke particularly asked for some experience at SF/C positions but this one particularly stings knowing that's not the case. Mitch would be the last one I'd expect to panic buy under pressure.
Probably straight from Jeannie's mouth:
For years, Jeanie Buss and Lakers fans had waited for the franchise to clear the kind of salary-cap space it needed to bring in superstar free agents, particularly in the wake of Bryant's retirement. For years, the fans had hung their hopes on the lure of Los Angeles and Showtime. Suddenly, within the first 32 hours of free agency, Kupchak and the Lakers had committed most of the salary-cap space the team needed going forward to sign two role players in their early 30s.
and...
While she has never directly asked her brother and Kupchak to consult with her on the decisions being made on basketball matters, in 2014, after the Lakers ran out of players during a game against the Cavaliers, she pointedly asked Kupchak if there was any other support she could give so that didn't happen again.
The game was an embarrassment for the Lakers and the NBA. The Lakers had allowed Steve Nash to play the night before, knowing he'd be unavailable on the second night of a back-to-back, while concurrently deciding not to sign Manny Harris for the rest of the season after his second 10-day contract expired. The Lakers ended up with only four eligible, healthy players for the final 3:32 of the game when Chris Kaman fouled out and Jordan Farmar and Nick Young left with injuries. Video of Kaman lying down on an empty bench with a towel over his face went viral.
The next day, Jeanie Buss found herself dealing with the fallout from both corporate partners and league officials. When she saw Kupchak at the Lakers' facility that day, she couldn't help but ask the leading question about her support.

If this kind of article came out against a different GM I'd be surprised if he finds another job in the league. Its really tough for Mitch.
There's some other fluff stuff in the article as well if you are interested in reading from the full link but these were the hard hitting points.