GNR's cover of the Rolling Stones classic, Sympathy for the Devil was pretty damn good. I won't say it's better but, it is pretty darn good.
I've always thought Guns N' Roses' version of Live and Let Die took a pretty shitty song and made it quite good.
Neeka Keet wrote:
I think the random Clash in it is awesome.
And The Clash did a dynamite cover of I Fought The Law.