He's one of my faves, personally, but its all a matter of taste. I've only seen him since he debuted in the WWE, and even at that time, wasn't too much of a fan of his until he took the ECW title for the first time. He was particularly hot after his second cash in, don't know if you were watching during that time. Jeff Hardy was his natural foil, and really helped propel him.
For me, he's tops on the mic, and he does all of the little things fantastically. For example, after he beat the shit out of Jeff Hardy, he had this fantastic ditty:
Plus, IMO, he can really go in the ring.