Upon reading many reviews, it looks like Dance Central, Kinect Sports and Sonic Free Riders are the best games out.
As I suspected, too many of the titles went too simplistic with their concept. For example, Joy Ride looks enjoyable, but they really could have gone deeper with the customization. Since avatars are so customizable, why not carry that over to the vehicles? Imagine B-K Nuts & Bolts levels of customization combined with racing and combat. Add in a track editor and you've got quite an awesome concept for a kinect game.
Adrenalin Misfits looks like an alpha version of Free Riders. Very little interactivity aside from leaning, slow speeds and a missed opportunity at using a recognizable Konami IP.
The rest are lesser versions of Kinect Sports, Dance Central and
Your Shape Fitness Evolved (which are the best of the genres thus far).
Though its good to see the hardware is receiving positive reviews. It seems that your liking of the hardware depends on how well you set it up and how willing you are to move about. I saw a few videos where the dudes stood too close and made half-assed movements, of course you'll run into problems if you do two things that the manual advises against.
While I have read two mediocre to negative reviews for Free Riders, I really have to question if "steep learning curve", "not casual friendly" and "exhausting" are bad things (the major reasons for the poor scores). I'd actually prefer a Kinect game that I'd have to master rather than a racer like Joy Ride that basically hands you first place (check out the first timers smoking the competition in Joy Ride preview videos). Marking a game down for being "exhausting" is something I think quite a bit of Kinect games will have to get used to. How are readers to know if the writer is in fact a 5'7" 250 lb dude who hates working out? Some people hate working out, and in turn I think we'll be seeing game scores suffer as such, which really is a shame and says a lot about society nowadays.