One of the most controversial FPS games (Postal 3), rejected by Valve, suddenly reappears on Steam

nanoUFO@sh.itjust.worksmod to Games@sh.itjust.works – 45 points –
One of the most controversial FPS games, rejected by Valve, suddenly reappears on Steam
pcgamesn.com
7

Lol even Running With Scissors disavow this game. They poke a lot of fun at it in the Postal 2 expansions.

Why is it so controversial? Does it suck?