My pick is Five Finger Death Punch and the obvious answer is Ivan Moody. The guy radiates that alpha-male wannabe energy and it definitely rings through all of the songs he has written and performed with this band. The guy is just a prick and a self-victimizing asshole.
I think he’s the primary reason FFDP is mocked so badly.
Guns N Roses. It amazes me that there are people who listen to them in purpose. I can’t stand them. But 90% of it is just because of Axl Rose. Slash is a great guitarist, and it’s a shame he’s drowned out by the sounds of a clown punching a cat.
GNR is definitely one where I like the singing sometimes and hate it others. Strongly depends on the song.