My top candidate always seems to be Annihilator. Jeff Waters is so damn good. Seriously sick music, but man, they pick the most mediocore singers with god awful lyrics. It's this great band, with tons of groove, tight riffs, killer solo & then....that f'n singer. It's the weak link that sticks out & you just say "Ugh, why that guy?!?!?!"
As I'm listening to "Never, Neverland," I crack up because of how bad the lyrics are.
anything By Yngwie J Malmsteen