I think he's hilarious, but it seems he has one schtick ... to be an overbearing, annoying, "jump down your throat" out of control, talking fast kind of funny.
It's not old to me yet, but maybe 3 or 4 more movies from now it'll get boring. Kind of like Adam Sandler and Will Ferrell.
They don't get unfunny per se, they just get old.