Zombie AI needs serious upgrade. I have attempted to play the game numerous times and it's just not playable. Early Alpha and all, I know. It's just too painfull to spend an hour or so running around in a realistic situation only to have the environment and emersion go out the window when zombies randomly walk through walls, follow you for extended durations no matter what maneuvering you do. Kills the whole game for me. I was hoping to see zombies get caught in barb wire fencing. Get tricked by open doors or at least pause when you close a door behind you. They simply get phased by no physical objects and walk through any door or wall.