The Punch/Boot/Leg Drop combo and alone. It was okay for 80s, and hell, even the early 90s, but once the Cruiserweights came in, it made it look lame. I could understand if Hogan was Yokozuna-sized, I'd call that a legit finisher, but at his size, it's ridiculous to call it devastating, much less for it to win a match or a TITLE with.
Also, the Viscera Hump.