Great looking game, but the gun fights get very repetitive.
The gunfights are nice as in using carts and banisters to slide down to shoot bad guys, chandelier swings and other things in the environment. The special power ups are a little to powerful such as the barrage where you are invulnerable and have infinite ammo and shoots faster for 10 seconds. The stand-off is neat, but gets old.
Even though the gunfights are nice, its the same thing over again. Shoot 10 guys and go in a large room. After that shoot at least 20 to 30 dudes. The boss fights get insane since they can at least take 50 bullets to the head. The AI is nothing special, they just can take more bullets in the head later in the game.
The biggest problem I had on the computer was the camera and mouse control. The camera didn't move fluently compared to other 3rd person shooters like Hitman 47 games and Max Payne.
Overall it has some fun things, but it doesn't last for long. It's best to buy for under $20, or rent it, if there is any store that rents computer games.