I enjoyed it for the most part and for $20 I think its a pretty good deal. For me the only 2 things I didn't like about it is the limited replayability in a game that can be beat in 9-12 hours and I never cared for the gas mask needed to go outside. I understand why they are needed in a setting sense, but I always hate running through feeling I'm under a time limit the whole time (although that's more of just a personal preference). Other than that, I loved the story, setting, atmosphere, gun play, and just about everything else.
I7 2600K 3.4GHz | GTX 470 1280MB SC | Asus Sabertooth P67 | Corsair 2x 4 GB | 120GB Intel 5140 SSD | CM Silent Pro 850W | 120MM Liquid Cooler | CM HAF 922