Nickelback - it's recently been found that not only do they suck, but they rip their own songs off.
Theory Of A Deadman - They sound like Nickelback.
My Chemical Romance - "I hate emo music" - Gerard Way
Bullet For My Valentine - YEAA SHITASS VOCALS AND GENERIC RIFFS FTW
I can't really think of a definite fifth because so many come to mind, but these bands came close
Bleeding Through - They're SO bad and the only reason they're not up there is because the chick in the band is really hot
Metallica - I'm sorry but them being put to death would save their legacy...St.Anger was enough torture, we don't need a new album.