I bought this game as I really enjoyed KZ2 and had recently got my hands on the move controller and thought it'd be a good game to add to the collection.
Since playing the game using move I find it really quite dull when playing any FPS with the sixaxis, it's just not as involving and you feel very detached from the gameplay (it baffles me that activision aren't going to implement move into the COD series).
The story carries on straight from the end of KZ2 but seems rather poorly written or told. The gameplay however more than makes up for this.
If you enjoy FPS games or just want a hardcore game to use your move controller with, get it!