Major technology flaws make the game very frustrating!
There needs to be kinect troubleshooting built into the game - for example, if you seem to be outside the zone or the kinect isn't detecting you well it should pause the workout and help you move to the correct place before continuing, rather than assume you've given up at the side steps and stopping. I got so frustrated, I quit.
It would also be nice if the first couple of reps of any move (especially in the assessment) were used to show you the move and check your form, before being done as the assessment. Although I do weights and run regularly, I am horribly uncoordinated with aerobics - a little more flexibility with the game mechanics would much improve the game!