I have had this game 2 weeks now, and I can feel and see my body shape changing. The format if the exercise is perfect for me as I have a small child, and having to block out an hour for a fitness DVD wasn't happening recularkt enough to have any affect. However Your shape is perfect as I can turn it on 3 times throughout the day, for 10 mins at a time. It is also hard enough that it challanges me, but generally not too hard that I don't want to try. The game provides enough variety that I don't feel like u have covered half of the content, which is also good.
My only criticism is that it is not as clear to learn the moves as Dance Cenrral or Kinect sports. And sometimes if I can't complete the set, and I stop, it still counts calories even though I am not moving. Having said that, I still think its about the work and effort you put in, and the results you get rather than worrying about the calorie count being correct.
Overall, I think this is the perfect option for exercise for me, its flexible and effective.