I gotta say I hate Wii controls on FPS games, only because moving the cursor to outside of the view never actually works fluently for me, but this game was very good.
It takes awhile to get used to, but once you get it you will enjoy more than you would have enjoyed with any other versions of this game.
This is one of those game that you need to enjoy if you call yourself a gamer. Ocarina of Time, Bioshock and this.
For $9, I'd say it's really a good deal.