He's not that bad. Honestly.

But he killed it by saying "I'm white. Just wanted to prove I got skills on the.. on the rap game."

This is debatable because some people don't consider the following rappers music let alone hip hop but my vote for the worst of all time goes to anyone on Psychopathic Records (ICP, Twiztid, etc). The only songs that I've heard in my life that have actually made me angry because of how bad it is.

Gee i have alot of answers to that one.....um soulja boy, lil wayne, nicki minaj, Ja rule, etc

Eminem.

Can't think of any others but he is horrid D':

Haha how can you say Diddy and 50 Cent? They were amazing in their prime.

50 Tyson (Trying to bite Lil B's rap style)
Soulja Boy
Pitbull