Slash has a nice tone and can make a Les Paul sing, but he didn't invent guitar playing. But he satisfies people's perceptions of what a rock star guitarist should be and is not nearly as obnoxious as Axl. Slash might be the eternal teenager, but Axl is the eternal idiot.
Always liked Duff and his bass playing, especially in more recent years where he looks more and more like a nineties David Bowie! I wish he played bass in his own band.
Velvet Revolver was basically GnR with another singer and I saw them live a few days before they officially split from Weiland, but man what a great concert that was. He and the band did not communicate at all that night (things were already amiss) but rather he and the four others knuckled down separately, each trying to pull off a show to be remembered by. And memorable it was. It made me a convert as regards VR (and I did not own a single GnR album at that point). Matt Sorum's drumming is nothing short of propulsive and he clicked real well with Duff.