I just downloaded and played Fruit Ninja Kinect for about an hour and I have to say I have not had this much fun with a Kinect game for a long time.  The games are simple, but like many puzzle games it takes a while to master timing slices and avoid the bombs that pop up.  I can see where those people with kids could entertain their kids for a while with the versus mode as well as the challenge matches.  The 800 points that this game costs is well worth the price to get you moving and using the kinect if, like myself, you have been waiting for something other than the slew of workout games that have been coming out.