Ok, the question "who is the greatest guitar player" is a dumb one. By what standard are you judging? To quantify the value of one guitarist vs another is a subjective one based on aesthetic preference, WHICH IS TO SAY PERSONAL TASTE. Now if you just used this as your basis of comparison you'd go with who the most people like, well its my experience that there are far more tasteless idiots who don't know there ass from a hole in the ground than those whose opinion i'd value over the feces i just scraped off my boot on your door step.
How could you compare Django Rhienhardt and Andres Segovia? You could say John Williams is the greatest classical guitarist technically, but you may find his sound drab and boring. Compare Pepe Romero trying to play flamenco to say Juan Maya, oh he's technically magnificent but lacks soul. So it boils down to taste.
At his time Django was refered to as the greatest jazz guitar player in the world, and Andres Segovia the greatest classical guitarist in the world. Paco de Lucia is considered by many to be the greatest flamenco guitarist of all time. How to decide, you can't. Its like saying Dali is superior to Van Gogh.
Here's a moment many consider to be the pinnacle of acoustic guitar. Again how do you compare bucket head to either of these guys, you can't. Even in this video, Paco's technique is far and above John's but john is a superior musician who's better? Can't objectively answer a question like that.
crap i don't think this embed worked just youtube Paco de Lucia, John McLaughlin, Al Di Meola's Mediterranean sundance any of those names and title of song should work.
So aside from pointing out that this is a retarded question just shinning some light on you uncultured twits. If your going to talk about a subject like this do a little more homework or something, arguing about the validity of Jimi Hindrix give me a break. Just scrape my gums with a rusty spoon while plucking my eyebrows for gods sake. (i think i watched too much zero punctuation for my own good, damn you *waves fist*)
seriously aside from me being a dick. here are some names of some of my favorite acoustic artists. love em hate em i don't care just youtube the names and see how varied this area of music really is: Tomatito, Django Rheinhardt, Alvaro Pierri, Baden Powell, Ramon Montoya, or for something completely different Michael Ammott from Arch Enemy. If anyone even mentions the guitarists from Dragonfoce i'm going to caugh up a teste (oh crap i just mentioned that band i hate *cough*.... *splat*... damn)
Oh, and to answer your question: Yngwie Malmsteem (while i don't mind jimmi, acutally i don't pay him much mind at all, Yngwie is the A typical solo'ing self gratifying wanker that makes me hate most solo guitarists.)