I have heard almost all of Cobain's music, I just don't like it. That may have something to do with Nirvana being the most overrated band of all time (I got sick of hearing everyone talk about how "great" Nirvana was). The only credit I can give Cobain is that some of his meledy lines were decent (Heart Shaped box).

Anyways, my favorites list has changed a bit. My favorite guitarists are:
Dave Mustaine
Marty Friedman
Chris Polland
Jerry Cantrell
James Hetfield
Kirk Hammet (although Mustaine & Friedman are better than those two)
Bruce Kulick
and of course, Steve Vai