For me it's Postal 2
Fuck around, do literally whatever you want, run around and sneakily backstab people or unleash nuclear hell or just piss around with some weapons
Always a good time
I wish the devs a very pleasant healing from their lobotomy so they can get their shit together and realize Postal 4 sucks ass and fix it already

ALSO CAN YOU NIGGERS STOP WANTING TO FUCK THE COW