I stay neutral to this game.
Reason is simple, Akella is spreading way too thin when they did the whole game. It is understandable due to the low budget and stuff. Source engine, which can be good at times, can show its very ugly side if it's not properly programmed.
The bugs are serious and however it didn't fully stop me from finishing the game twice with different endings.
The cutscenes are pretty good and funny, and many stupid and funny jokes. Laughing on these jokes on a Christmas morning is priceless - despite they are offensive, the game delivers in terms of dark humour.
I hope they can make Postal IV. Did someone in RWS thinking of making it again using the latest Unreal Engine? No seriously, I wanna know.