I kept thinking that with the exceptions, IMO, of Jimmy Hendrix, Stevie Ray Vaughn and Kirk Hammett no one else could play all the music of all the other guitarists as well as VH could. George Harrison, Keith Richards, Eric Clapton or The Edge getting through 'Eruption', 'Ain't Talkin' Bout Love' or 'Hot for Teacher'? I don't think so. I can't think of anything Van Halen couldn't play extremely well, both artistically and technically.
I've played for 40 years..but that doesn't qualify me to say who's good and who isn't. However I'd never measure another guitairst by how close he could copy 'EVH' playing Eruption. A guy like Keith Richards is no where near as 'technical' as EVH but if you go back and look at the body of music he wrote and played for 40+ years I think he too is a great guitarist. Being a great technical player doesn't make a 'great' guitarist IMO. ..and I like Eddie Van Halen.
The best I saw live was Beck, Clapton & Hendrix. Clapton with Cream @ 1968 live was amazing.
I don't agree with a lot of the order on this list, but most of these guitarists that many so casually dismiss were/are truly great players.