as to Nirvana, it's not really a fair comparison. no one is going to call Kurt Cobain a guitar virtuoso.
To complain that he is not a guitar virtuoso is completely missing the point of why nirvana were a breath of fresh air.
I can certainly understand why there had to be a band like Nirvana. The 80s glam and hair metal thing was getting out of hand and boring. All record labels wanted the 25th version of VH and then the 37th version of GnR. There had to be someone different. And then ... the record labels wanted the xxth version of that.
Isn't it funny that they all claimed to promote individuality and originality at that time?
It was a remarkable time though. I don't think anyone could have foreseen what happened - not so much that Nirvana were successful, but that it had such a dramatic effect on the existing rock music scene, literally
killing dozens of bands' careers overnight (or so it seemed).
Of course bands like Mother Love Bone and Soundgarden already existed, but I don't know if they'd have ever broken through in such a big way, without Nirvana.
I loved a lot of the glam metal bands, so it was a time of mixed emotions, but it was really exciting to watch it all changing. Of course we then had that weird period where bands dumped their spandex and Ibanez in favour of plaid shirts and Jazzmasters, which was utterly ludicrous.
Then Nu Metal came along and we had ten years of downtuned metal albums with no guitar solos.
That was really boring.