The Resident Evil remake on Gamecube. Nothing comes close.
I hate zombie wave shooters like Left 4 Dead or Zombie Mode or Dead Nation or Dead Rising. If it offers co-op and advertises shooting hordes, I'm not interested. I admit, however, I enjoyed the first Nazi Zombie's atmosphere at the end of World at War. I'm not looking for stress relief, wish fulfillment, or social experiences when I'm playing a zombie game.
Survival games such as Dead State don't appeal to me.