Postal 1 wasn't black'n'white like Hatred thus making it easier to see enemies or things that could get in your way, the isometric perspective was a tad better (well in Redux anyway, not so much in Postal 1 OG) and it was easier to aim, there wasn't any dumb execution mechanic for restoring HP with a 50/50 chance when it would work or not (i.e. shooting a target in the legs or kicking them and hoping to whatever God that they won't die), the enemies weren't insanely super accurate in postal 1/Redux, unlike in Hatred where they can hit your ass from across the map with perfect accuracy. Also, I'd say the story of Postal 1/Redux never reached the absurd levels as it did in Hatred, sure storming a military base is still borderline stupid in both games, but at the very least Postal didn't end with you blowing up a nuclear base, combined the Postal dude seemed like a crazy guy who snapped (or assumed the town was contaminated by some weird virus-like in Redux) while in Hatred...the guy is just some edgy twat who wants to murder people.