Rather disappointed by Zombi. It was the one game that most tempted me to buy a Wii U so I was pleased when it came to the Xbox One. But it's nowhere near as good as I'd been lead to believe.
The map is incredibly restrictive and linear, there are hardly any zombies, there's barely any different zombies (there's about 10 skins total), there is a massive excess of ammo and health kits, the lighting effects are weak, the graphics look like early xb360, and mirrors don't reflect.
It's also ridiculously easy, from what I've seen so far (I believe I'm approx half way through it). I've been killed twice so far, and in both instances it was me accidentally dropping a claymore at my own feet. The zombies are no threat. Avoid picking up explosive ordnance and you can breeze through the game.