I have always had a mystical concept of Henrix as an untouchable guitarist who superceded humanity with raw talent and vision.
I think it would be hard to overrate Jimi Hendrix, unless you said he was a virtuoso that transcended Segovia, Joe Pass, Django Reinhart, Eddie Van Halen, and Steve Vai all in one.
And no one ever said that.
For the most part, the evolution of rock guitar has been just that--an evolution. Two figures, however, abruptly broke with what went before and redefined rock electric guitar: Jimi Hendrix and Eddie Van Halen.
Once an interviewer asked Dizzie Gillespie, "What do you think of Louie Armstrong?" Dizzie's answered, "No him, no me." In other words, even though Dizzie could technically play circles around Louie, and played far more complex music, the jazz world Dizzie entered would not have been ready for bop had not Louie jumpstarted the jazz soloing concept 20 years earlier.
Likewise, some people might be unimpressed by Jimi's licks or his sound, or the limited few effects that he was using, but bear in mind, NO ONE WAS DOING ANY OF THIS at the time. No Jimi, no Eddie. Also no Robin Trower, Stevie Ray Vaughn, Robben Ford, Tommy Bolin to name a few.
Effects? There were none. Jimi had an insatiable quest for new sounds. He was in direct touch with Roger Mayer and other tinkerers and inventors. The concept of effects was so new that he was playing the prototypes--from the inventor's garage directly to the stage. One of the first with a wah, probably the first with an Octavia, a rotary speaker effect, and whatever few others could be scrounged up at the time. And he integrated them musically into his act from the get-go. When Hendrix worked effects into his act, they were fully formed; they did not sound like gimmicks for their own sake.
Second, there was his voicing. Nobody was doing the elegant little chord melody fills the way he was doing them. Just listen to his comping on "Hey Joe." It may sound somewhat commonplace now but no one in rock certainly was playing like that. Some jazzers were, but they weren't doing it on a Strat into a dimed Marshall stack.
Third, he had a feel for his music that has rarely been equaled. The Project Hendrix's Blues compilation shows his incredible range and feel for the blues. One cut is just him and a slightly out-of-tune acoustic 12-string guitar. You'd SWEAR it was an Alan Lomax recording done on the front porch of a shanty in the Mississippi Delta. I have recordings by Robert Johnson, Blind Lemon Jefferson, and Charlie Patton, and this impromptu acoustic number by Hendrix totally cops that vibe.
Then play further into that CD and you'll find that he could do blues as well as just about anybody, while taking the sounds and the inventiveness of the solos to heights that would never be realized by Wolf, Muddy, or any number of blues giants. In fact, there is stuff on that CD that I don't think anyone has caught up to, including SRV.