It's kind of funny to look at the Postal games and see how what was once shocking humor is now more or less par for the course. Decapitation? Sure thing! Frequent course language? Ho-hum. Urinating on everything in sight? Well, okay, that bit hasn't been imitated just yet.
The game puts you in the shoes of the Postal Dude, a short-fused sociopath with a shock-jock voice. You're given a list of menial deeds by your nagging wife, and the game leaves you alone to do them more or less as you see fit. This "open-world" aspect of the game works decently, although frequent level-load triggers can annoy, and the inept AI can often be more annoying than amusing when it starts random firefights with itself for the hundredth time.
While the concept behind the game is solid, the actualization is lacking and the game feels like it's in desperate need of a few more months of solid polishing. That said, it can be fun, and there's definitely worse ways to while away a rainy afternoon than throwing molotovs at elephants.