I haven't watched any of his movies outside of Postal, but as far as the comments of "no good goddamn reason", did he even play the game? That's pretty much the theme of Postal and Postal 2, random violence. It's a fun game just for the sheer mindlessness of it, sort of like going on a destructive bender in a GTA game. I think the movie was fairly true to the game and I enjoyed the absurdity of it.