Rule number 1: Critics are a bunch of idiots. Never listen to them, kay?
Now that said, I will say that there is two sides to this game... it -is- one that you will either love to death, or hate to death. I for starters love the Riddick series, my favorite out of movies and shyt. As the game goes, I cant call it anywhere close to my favorite. In fact, I'd call it more of a renting game than a buying game (the replay value, unfortunately, isn't too great, and the multiplayer DOES suck). That aside, it's hard to beat snapping necks in the dark, or jumping on someone from the ceiling and jamming your Ulaks in his throat. :3
So the only thing I can say is pick it up and look for yourself.