I hate, just hate, the album version of Kiss's God of Thunder, but they speed it up live and it sounds amazing. STP was amazing in the Fargo Civic Center which makes me think the person who mixed their album just hated life because it is noticeably inferior. On the other hand, Aerosmith has sounded like crap the two times I've seen them in concert.
It gets weird when you buy the import (for the US) versions of some songs. A lot of the Seattle bands sounded better to my ear on the versions sold in Europe. Japan is always an odd duck.