Well, I played Eternal Damnation mod for Postal 2, and I am very pleased with it. It's like playing the first Blood on a true 3D engine. Very atmospheric, from beginning to end. It's a FPS, so it does get a bit repetitive and boring, but there's a lot of weapons to choose from, the zombies are well done, the soundtrack is great! The story is okay too, a bit trashy perhaps, but I like it. Levels are simple, with minimum backtracking. A couple of scares, especially in the beginning. There are some bugs, but for a free project it's superb. It's very different from Postal 2 itself, the humor is much darker. I recommend to try it!