Eh, I'll keep it short and to the point: Bought it, tried it out on hitbox, and was disappointed. It's not a terrible game, but there isn't much to mock. The gameplay unfortunately is mediocre.
It's an arena shooter masquerading as a murder sim. There's gorier games already out(Like Manhunt 2), and more interesting shooters as well. That being said, the game's not a complete waste, so if you want a somewhat improved Postal with none of the humor, you might enjoy it. The best part is the destructible terrain. The worst part is how difficult it is to see your damn crosshairs in game, which can make life miserable if you're trying to aim.