In terms of zombie games on Xbox, well, we're spoiled for choice really.
As far as games are concerned, it's not too hard to see why these moany, groany bags of putrid flesh are so commonly employed as the enemy, they're already dead so you're not killing anyone, and they also fall apart quite easily when shot or beaten which is always very funny. Zombies! There's just something about the shambling undead that keeps video game creators, movie makers and pop culture in general coming back for more.