Yeah, the most notable band change is Green Day. I really liked their old stuff, but I don't like their new songs all that much. It's not that I don't listen to it because it's "new," I just prefer the old "Dookie" days over "American Idiot". It's all a matter of preference. Besides, I wasn't a hardcore Green Day fan. Their song played on the radio, and I liked it. As for My Chemical Sodomy, Fallout Pedobait, and Panic! @ the Gaybar, I never liked them.

There's nothing wrong with change. Change is a good thing. Music changes with the times, with the people.

There's only one reason to call a band a sellout: If they they go against everything they stood for before because of money. Their lyrics and sound don't have anything to do with that.