Ok, the first few hours of this game are boring as hell. Then, much like Red Steel, you receive some new abilities which makes the game a great deal more enjoyable.
But if you're a FPS fan, you should rent this game for one reason: the melee attack.
If you get close enough to an enemy and then make a quick stroke with the Wiimote, you automatically rush up to them and kill them. IMMENSELY satisfying, although I recommend holding A to lock your camera as you do so because you'll otherwise find yourself moving the camera while trying to slash.
By doing melee attacks and headshots, it builds up your predator gauge which can be turned into health, making the character into a vampire of sorts.
The graphics are a sub-par porting job and it shows, but it does have a few very satisfying gameplay elements which FPS fans will enjoy.