I'm not really into the whole "league table" approach to assessing guitar players, and I always think it's tough to say anyone is "better" than anyone else, it's art not a sport...
That said, I do agree with the comments about Kirk Hammett, I've never found anything about his playing particularly inspiring. Maybe something to do with the fact that, unlike many rock/metal guitarists, he's not really one of the main creative forces in the band? I have to say also that I've become pretty disenchanted with Metallica in recent years so maybe that's turned me against Hammett a bit.
On the other hand, there seems to be a whole school of "Kirk-haters" and he doesn't deserve that either - he gets singled out for criticism which loads of no-better-or-worse players ever receive.
Good call on Chris Poland, I've always been a fan, he very much has his own style. Much preferable to Chris Broderick!
I always go back to the '70s players I first got into when I was a teenager, maybe it's nonsense but to me they seem to be more unique than the majority of post-EVH guitarists. Rick Derringer, Ronnie Montrose, Frank Marino, Robin Trower, Martin Barre, Randy California (already mentioned), Leslie West, Kerry Livgren, the guys in Wishbone Ash. They're my heroes and always will be.