1) Eric Clapton: he brought black music to popular white middle class consciousness, and got a lot of people started playing guitar, whichis a GREAT contribution to music history, but he's never played a note that has surprised me in the least. Yes, the most overrated guitarist of all time.
2) Mike McCready of Pearl jam - most of his solos just plain blow. Noodle city.
3) Buckethead - wheedly wheedly wheedly...
4) Yngwie - Wheedly, Ego, Wheedly, Ego...
5) Steve Vai - Wheedly, 'guitar melisma melodramatics', wheedly, EGO, EGO, EGO...
6) Satch - Ditto, ditto, ditto
7) Ritchie Blackmore, or Ace Frehley, or Tommy Iommi, take yer pick.