While the game plays fine on a technical level and uses a the Kinect perfectly, similar to Just Dance, the speed and coordination needed to pull off the moves on even a lower level is incredibly difficult. There’s no warning up period of difficulty ramping, you just get thrown in the deep end.
While a game based around Zumba was always going to be more of an intentional workout compared to Just Dance or Dance Central, there’s a level of quality control we should expect from games made specifically for the Kinect that simply isn’t present here.