Jimi Hendrix said Phil Keaggy. I agree. All mentioned except Cobain are really special but Phil Keaggy takes the cake in my opinion.
I think you guys are being too tough on Cobain. Sure, he wasn't technically proficient but he could come up with simple riffs that absolutely rocked.
Maybe I missed the comments, but did not see anyone say anything rough about Cobain as a guitar player. But, I will. His stuff is like coffee grounds compared to any one of a hundred guitar artists. And, those are not actually riffs in the original sense.
