I think you've almost answered your own 'question' there - players who can do things nobody else could have a lot of love. I seriously think in terms of ability he is up there with the very best, in fact arguably better than the media darling Paul Gascoigne in terms of raw talent:
-Very good with both feet.
-Not the quickest as mentioned but was still a very effective dribbler, if you are tough to win the ball off you don't need to be lightning quick
-Lethal from the penalty spot (46 out of 47 pro pens scored iirc). Not hard in theory but bear in mind the average success rate for the top flight is about 75%, and how England could have done with him!
-Dead ball specialist
-Incredibly creative goalscorer, if you watch the vid I posted earlier you will probably find at least 5 'unique' goals
-Entertaining to watch
Ultimately it is hard for people to rank him up there with the superstars from title-winning clubs (MU, Blackburn, Arsenal, Chelsea) because he didn't get much limelight and was criminally overlooked for England. So I can understand people not considering him as a peer of Henry, Shearer, Scholes etc.
I have still yet to see a video showcasing a single player that can compete with MLT's vid in terms of quality of goals, and that includes all the players mentioned in this thread.