No. That's not the reason. The fact that a lot of people like them is testament not to their suckiness, but to that of the music industry.

The band itself is bad because of a combination of bad singing, bad instrumentation, stupid songwriting, awful live performances, and that their music sounds predominantly the same no matter what song of theirs one listens to.

That being said, they have one good song. Fix You, from X&Y is just that.