Off the top of my head I'd have to think the following have failed to get due credit from critics and not enough name checks from fellow guitar players ...
Ariel Bender / Luther Grosvenor
Eddie Hazel
Brian James (if only for Damned Damned Damned)
Ernie Isley
Mick Taylor (for the four album run starting with Sticky Fingers)
Billy Gibbons (for everything up to Deguello)
Peter Frampton (Rockin The Fillmore - nuff said)
Joan Jett
Zal from SAHB
Jones and Leonard from Man
Ollie Halsall (for Patto though not for much else)
Wendy Melvoin
and in acoustic land the following don't get nearly enough credit for their guitar playing ...
Nick Drake
John Martyn (for everything up to 1977)
Roy Harper