I mostly agree with Romier. The first half of this film is absolutely sublime and creepy as all heck. I've never played the game, and frankly I could care less how faithful they are to a freakin' video game, so let's get this out right now -
I think I would have cut Bean out completely and focused on spreading the exposition around with the clues rather than dumping it all out at once. Bad move.
First half awesome, end not so good...overall? It's worth it just for some of the visuals and the first half.