As much as I love greenday, and I don't use this term often but I have to say a con would be that they've sold out to the pop-rock, mainstream, trl crowd.
They definitely have gone more into the mainstream. I'm not really quite sure what "selling out" means exactly, so I can't comment on that (hopefully someone could tell me ) As for the pop-rock thing, I've always thought of them as a pop-rock band for the most part. And as far as TRL goes, of course they're going to be on TRL. If they make a video, they get a catchy song that alot of MTV's viewers like, they're going to vote for that song on these shows. I don't necessarily think that what you're saying is wrong, nor do I see why those things would be bad. It's just part of having fans of your band and getting more recognition. That's all, at least the way I see it.