Obviously, most of the greats have been mentioned-Beatles, Zep, Sabbath, Elvis, etc

As for how they rate- best range(voice)-Elvis, best at jamming, and most talented at every spot-Zep, the best musical geniuses-Beatles.

As for the other arguments-
For me-Oasis is good, not a great.

The Seattle grunge bands i like alot, especially Alice In Chains(alot of their music is depressing I admit).

I like alot of Rock and Metal, and alot of heavy stuff, but I got to give an honorable mention to Van Halen, not to be confused with Van Hagar(although I like Sammy, and they were still good).