Zombies ate my neighbours is awesome! Though too short. 
My favourite zombie games are:
· Dead Rising (this one is one of my favourite games ever, too. The plot is awesome - for a zombie game -, and the game itself is quirk, cheesy, fun and full of things to do and to kill in plenty of different ways. One of those games with a "unique" kind of charm all over it).
· Resident Evil 2 (Not scary anymore, but still awesome as ever. It's getting a remake!)
· The Evil Within (If we can count the Haunted as Zombies; if not, then erase this game from the list)
· Deadly Premonition (not exactly zombies, more like ghostly zombified haunted people, but still damn awesome)
· The Undead Nightmare (From Red Dead Redemption - DLC done right, and it's a blast to play)
