I feel like I am slowly heading into the future. The Wii was an incremental device (same with PlayStation's Move) where I still had to have some form of device in my hands. Now all I have to do is wave (or speak aloud).
Now that I have had 2 weeks to play with Wii-killer device? I can definitely say that the odds of me using the Wii for anything except the odd Nintendo specific game (like Mario Cart) are exceedingly low. I actually booted up the Wii last night just to get a comparison and there really is no comparison.
I have tried 4 different Kinect games and am blown away. And so is my GF, one of my long term friends, my ex-roommate and (this is important) my parents. It really is intuitive system, easy to figure out how to use and interact with it. Though most of the games are more focused on children (Kinect Adventures, Kinect Play) games like Dance Central are basically killer apps. Watching my parents dance to Lady Gaga's "Poker Face"? Pretty much made the system pay for itself (particularly when my Dad beat my Mom by almost double).
And really, anything that get people up off the couch and moving? It is a good thing for America. I have yet to use Kinect and not break a sweat.