Didn't like SS2. Thought the RPG stuff felt tacked on and there were too many useless skills, and a few skills that were absolutely ESSENTIAL (Fine if you know what you're doing, likely to fuck you up on the first playthrough). Something about the level design bugged me too. Also the ammo scarcity and weapon breakage rates kind of wore on my pretty fast. I found it more tedious than tense, not, oh no I'm out of ammo, more, oh boy time to kill respawning zombies with a wrench again, since the gameplay mechanics, as they are, don't make killing things with a wrench all that interesting.
Same flavor complaint I have against Fallout 2 sort of. It's the original game with more /stuff/ added.
IDK maybe I'll try it again sometime.