As I lay dying, three days grace, Three doors down, (one hit wonder) Umm...I know there's more but my heads all scrambled. There's plenty of horrible bands, if they stop making good music and sell out for money (Metallica) then they're shit for a band. And there's plenty of them sell outs out there.
Edit: add slipknot there too, can't forget those bastards.
If I were being serious, I'd name The Shaggs, who fall into that category of so bad it's good.
But that isn't an option, so let's see here. There's Nickelback, helmed by Chad "Only Knows Four Notes" Kroger. And then there's Nirvana, the depressed kid's dream, who aren't all they're cracked up to be. I mean, a couple of drunk Finns did a better rendition of Smells Like Teen Spirit than Kurt and Co, so maybe the world is better with him six feet under. Jonas Brothers I don't even need to talk about. And then there's Coldplay, the band that people who are trying to be indie listen to when they don't know anything about indie. Pro tip: just because there's an orchestra doesn't it good. Soldier Boy comes so low on my respect list I don't actually care than I'm misspelling his name. And finally, PanicÂ¡ At The Disco killed emo.