Maybe, but for him on a personal level, it's a good thing. Old Zack had some serious issues, but new Zack has grown up considerably over the past two seasons. I think it happened somewhere around his last big blow up with Amanda over her threatening to release some damning info that would ruin his & Jenna's relationship (lol- didn't work). Between the end of filming and the reunion, those two most have gone home and had some long talks about his behavior and how he responds to immature retards like the Lavender Losers. I just remember him on the reunion being very subdued, apologetic, and acting like a mature adult while Amanda just showed herself to be a psychotic bitch with the emotional maturity of a 10 year old.
I'm a fan of Zack, so that's how I see it. I'm sure someone who hates Zack will be along shortly to tell me my opinion is completely wrong and Zach hasn't changed a bit. They'll be wrong, but they are welcome to their opinion. So yeah, Zack has become boring, kind of like CT. But I find him pretty funny and sincere these days, like CT, and it's definitely better for both of them in the real world that they figured this shit out.
Yeah, yeah, I know. Too many words.