He's definitely got some skills.
He's one of the best I've ever seen at spotting someone else's perceived weak point. Thus Low Energy Bush, Lyin' Ted, Crooked Hillary.
He's also very good at testing his messages on the fly. He has a con man's skill for reading an audience, and telling them what they want to hear -- even if it's the exact opposite of something he said a few minutes earlier.
He can speak (seemingly without end) without notes. And, not surprisingly for a businessman, he remembers numbers and uses them well -- even the ones he makes up.
And he is an absolute genius at getting the media to cover his every move.