Firstly, this game has an excellent story, world disaster, mistrust in your fellow humans and other beings... all along with unique and scary monsters. The graphics are good, nothing to complain about... HOWEVER... the game does have its glitches, and unfortunatly they are noticable unlike some other games. Some of these include;
Characters standing and moving, however their gun is frozen in place
Story characters stuck in place (only happened at 1 stage for me)
At busy points in the game, (full of action), monsters sometimes glitch and get stuck in walls or on debris.
But don't let that put you off! It is well worth buying and playing! You'll be hooked!