I'm surprised Your Shape isn't doing better in the US honestly, it's had a TON of advertising. Nearly as much as Just Dance 2 even... I think Ubi might've been expecting it to be bigger than this.
Kinect Sports is doing phenomenally though, as has Dance Central (though it's been pushed like crazy) and I think Kinectimals has been doing decently too. All 3 have the right makings for legitimate evergreens imo.