Pretty good as it's the 250Gb version with Kinect and 4 games. Dance Central 1 is pretty good and the missus likes it, so assuming the second is good seems reasonable, Kinect adventures is good and show cases what the Kinect is all about. Kinect sports is also good, the missus doesn't like it but I do.
Saying that I hardly use the Kinect as we live in a flat and when I manage to get on the xbox it's usually at night and I'm sure my neighbours wouldn't like me jumping around
If you don't like any of those games you can flog them on, but I think your missus will like Dance Central 2