I guess its all a matter of what you're into... Postal was the only movie i saw of his. It attempts to coast by on low-brow, juvenile humor with no semblance of wit or creativity. "Oh look, its Dave Foley taking a shit." "Oh hey, George Bush and Bin Laden are friends, thats original, political humor." "Its Verne Troyer being raped by a thousand monkeys." Sure, I chuckled once or twice, but his commentary was entirely unoriginal and went for shock value over everything else. The jokes and sight-gags also fall pretty flat a majority of the time. He obviously isn't trying for high cinema, and low-brow humor and sight-gags is fun every now and again, but if Postal is his best film to date, that doesn't make me want to try any of his other films.
I will say the intro of the movie is actually pretty damn funny.