I just got it yesterday, and it's a pretty cool game. I have to disagree with people calling the boss battles easy, though. The first boss took me around ten tries, and I was going in with 2 emp grenades and 2 rockets. I eventually beat him by just fleeing in terror while nailing headshots with the revolver.

Run to cover whilst emtyping AR magazine after AR magazine into him.
Pretty easy imo.

I didn't carry an assault rifle at the time. I just had a rocket launcher with 2 shots, my revolver, and my 10mm. I like handguns, but figured the rockets would be enough when combo'd with the EMP.