Limp Bizkit could have used some other vocalists, because Fred Durst got old fast. LB should have released more instrumentals.
There's also SoaD. Serj's vocals sucked dog ass and ruined the entire band. It's unforgivable they never released instrumentals, since that's what their band had going for them.
There's also Nirvana. They had so much potential, yet blew it on using the same fucking chords and tuning all the time and having pretty much every song sound almost the same. Even though Nirvana was a great band, the lack of musical talent held it back.
There's King Crimson. They could have been amazing, but every one of their songs had the "vaporwave rhythm aesthetic" and were actually really boring to listen to. You'd think the band that made 21st Century Schizoid Man would be a lot better, but no. That was their only song on the Moonchild album that wasn't boring to listen to.