It's a great movie if you turn your brain off.
It is way better than the farces out there these days that are full of pop culture references that are not funny.
Dubya and Bin Laden holding hands and skipping through a field at sunset is funny.
A Spartan saying "You got served" is not.
I may even buy Postal when it comes out. Yeah, I said it.
Incidentally, episodes 4 and 5 of Dread Media should give you all you need to know about Postal and my review is this installment of Reel Dread.