Definately not a one-hit wonder......pretty much a one-trick pony though - not necessarily a bad thing, but for the most part, the joky-sadistic-comedy-punchline thing is what he excels at.
Aside from his weak ass production, I think he tried to stretch himself too far on Encore and that's why it was so wack. He needs a balance, or he takes the comedy aspect too far and you get garbage like "Puke" and "Ass Like That".