In a similar thread (weak songs by great bands), I can’t stand “Black Hole Sun.” I don’t know why because I really like Soundgarden, but it just drives me nuts. I also realize I’m probably the only person who feels this way.

I like Superunknown, but loathe this song. Too much play, and the video was pretty disturbing.

Covers better than originals
I like the Type O Negative covers:
Summer Breeze (Isley Bros.)
Cinammon Girl (Neil Young)
Hey Pete (Hey Joe - Hendrix)
Day Tripper (Beatles)

Worst song ever
I'd have to go with Joe Walsh - Life's Been Good. I can't stand that... [whiny voice] My Maserati does 185 ... [/whiny voice]