This game is at least a 6. I do wish they would have added more content, however once I got it going, I really enjoyed myself. I was hoping my 3 year old would be able to play (he's been wearing out Kinect Sports etc and needs something new), but he definitely cannot play this game.
Though I have given this a 6, I hope that it is not going to be the trend for the next round of Kinect games to release things that could be better. The initial game offering was very limited and then Kinect sold like mad, so I'm sure there are gaming outfits everywhere scrambling to churn some out and make money before the market is flooded.
I see this game has a low rating and I don't understand why. The product is exactly what I saw advertised, and exactly what the demos on IGN and others showed. It's not really so much a game as a mental exercise. I love it. The game is a series of short fast-paced mental challenges. It covers hand-eye coordination, memory, visual acuity, math skills and problem solving skills. It's challenging in many ways, not least that it was made for a Japanese audience (meaning metric and 24hr clocks). It's all about exercising the mind. For example: I have good math skills but a lousy memory. Within just a few days, however, I saw an improvement. A healthy mind and body are important. And because this is Kinect you get both.
For starters the sensor acts rather oddlike, detects movement very slowly and when in use movement seems to lag. Exercises are designed for teens and up, basic knowledge of math is a major plus. To get most achievements you need to keep game for almost a month and must be very flexible and agile in movement.