While on one hand I loved Undead Nightmare, I also have a dislike for zombie games. I know that seems weird but I feel like the idea has been done to death now. The story is excellent as to be expected with any Rockstar game and is longer than what most other games will give you for DLC. However after you have completed the story and performed the new challenges, there's not a whole lot to do unless mindlessly killing zombies is your thing. That's not necessary the fault of UN though; it's more of a fundamental problem with zombie games. While single player might not leave much after the story and challenges, multiplayer defiantly does shine. It's similar to the survival mode of Left4Dead where you work as a team to fight off waves. If your team performs well and sticks together, you all get some nice surprise weapons and abilities. It's really fun if you get into a session with friends or people you know. Watch out for dying though because once you die, you don't come back. If you enjoyed Red Dead Redemption or if you even just love zombie games, I'd say you should go out and get it right now.