I'm actually more surprised to learn how critical the fans are of him. Some her speak of him as if he was some kind of uncontrolable loose cannon and ingrateful stuck up party boy. The fact is that most fans here when thinking of the shows production would rather have this idylic happy happy joy joy fantasy picture in their minds than the truth. You attack him because he's being honest and it just isn't what you want to hear. "The set was fun because the guys goofed around and still have dinner once a month!" The fact is that a large part of the cast have voiced criticisms either during or after production of the show. Wang might be one of the more vocal actors, but Beltran, Mulgrew and now Ryan followed suit.
I find it embarrassing when complaining about how they were treated badly becomes the actors schtick. I think they look bad playing into the fanboy desire to be in on Trek dirt.