I'd have to say post apocalyptic, but in a specific, non-general kind of way. I enjoy games like Fallout, the Metro games, the Metal Max games( I really wish they'd get more love in the U.S) And even Shin Megami Tensei. I enjoy murdering zombies, don't get me wrong, but I prefer them to be part of the package and not the whole thing. I have a distinct image in my brain and when I think "post-apocalyptic wonderland", I think of things like:
•Mutants/Zombies/Mutated Zombies ( animal and human) or Supernatural creatures
•Raiders/Bandits/Gangs
•Settlements made from the husk of things that used to be
•A world that is no longer the same, yet includes the fragments of the familiar
•A lot of improvised weapons and the occasional, coveted piece of old tech
•The collapse of society as we know it and the rise of something more primitive
•Modern currency being rendered useless and replaced(sometimes by something hilarious such as bottle caps)
•Cyberpunk elements
What are some of your favorite video game settings?