Santi Esponja said:7 Days to Die.
Registered on the site just to point that one.
Yes, it has bugs and it crashes every 3 or 4 hours BUT it's only because I play it in chunks of 4 or more hours at a time that I notice this crashes and once the game hooks you, that's it. No worries about draw-distance, framerate, textures, nothing... Just pure zombie and survival awesomeness.
As Daddy Peaches pointed out, there is Minecraft. 7 Days to Die IS that hypotetical Minecraft with realistic graphics and a dark mood.
God, I just freakin' love the game, and it's on discount today I think as part of last weeks Deals.
I agree 7 days is like crack