Doesn't surprise me at all. Even if he has underwhelmed in his career, he is good enough for 5-10 minutes per. I'd want to leave too if I were him.
One can only hope Fab Melo doesn't have this attitude.
I think Melo realizes he's only played the sport for 5 (?) years and has some improving to do. Hopefully in a year or two he'll break into the rotation and be happy with that.
Darko is a different situation, I think. He's NBA-capable, and has zero minutes. I see where he's coming from.
Darko has been lied to at just about every stop he's been at in the NBA. Combine with that the immense pressure of being the #2 pick + the mental anguish of failing to achieve his goals time and time again and you have a player with a very low tolerance when things don't go to plan.
(1) Detroit = told he would be a franchise cornerstone = lie
(2) Detroit = Flip Saunders told him he'd be in the rotation = lie
(3) Orlando = told he had a long term future there and they would re-sign him to a long term deal in free agency. That they wanted to build around the twin-tower lineup of Darko and Dwight. Then Rashard Lewis and his $120 million came along. Dumped Darko within a few days of free agency opening after all the sweet-nothings he and his agent had been told over the last few weeks = lie.
(4) Memphis = told he was coming to play with Pau to reinforce their interior to help make them more of a threat in the playoffs. A stable situation that would beneficial to Darko's development. Two months into the season Pau is traded and Memphis went into the gutter, another lottery bound team = lie.
(5) New York = told by Donnie Walsh that Mike D'Antoni would be the perfect coach form because Darko could finally play out in the perimeter like a player with his skill-set from Europe should. Walsh was clearly working off a 6-7 year old inaccurate scouting report. Awful situation for Darko because he isn't that type of player. Things went horribly = misled again.
(6) Minnesota = Kahn said Darko would be the starting center, play 25+ minutes a night and could revive his career there. For awhile that is how things went and the early results were positive but underwhelming. Clearly there was some talent there but getting it out of him consistently was a problem (because he was overweight but nobody gets him to drop the excess muscle). So that didn't last. By his final season, Darko was dumped from the starting lineup and his playing time minimized despite being Minnesota's best interior defender on a defensive challenged squad. Oddly enough, this is closest anyone has come to keeping their word with Darko during his time in the NBA.
And now Boston, it's unclear what Danny said to him but I would guess Darko felt he either had the opportunity to play 20mpg behind Garnett as the backup center or take over Perk's old role as a 25mpg starter with KG sliding back to PF.