I've only heard good things about this game and I have to say that despite some really boring and somewhat bullshit AI it's a pretty fun (and sometimes funny) game based on the movies starring Vin Diesel and he's voicing Riddick once again in the game as well. Not much to say about the gameplay but it does mix it up pretty well. Sadly the AI is braindead so a lot of times you can just sneak up on them almost get seen and still backstab them. Or if you don't they just alert everyone immediately and you have to hide or kill them, something that isn't always possible because this is also a sneaking game. Overall it's a neat experience and it's worth playing through, especially if for some reason you liked the movies well enough.