Commercial bands seem so shallow, i have never truely appreciated a band that is known to be commercial. They tend to make their sound easy to listen to but many times lacking depth. I can't enjoy it for a longer period of time.

That's my opinion on it. I don't know about the rest.

EDIT: Terra said it so much better. What a suprise eh? Maybe i should add that i wouldn't discard a band that i liked just because they are commercial.