Just finished a 18-hour Gears of War session, now its time to play Pretty Dancing Fairy Princesses! Yeah, not gonna happen.
For $150, is anyone really going to by Kinect before they see that killer title they want to play? That's a steep price for something that MIGHT be useful.
People knock on the price of Wii controllers, but those work in ALL Wii games. You don't lose the investment in a second WiiMote because the new game you just bought doesn't use it. With Kinect, and its limited list of titles, its a lot of money to invest for little return at this particular time. If you think they'll release better titles in the future, might as well wait until they do.