For some reason I really like endurance mode in those Koei Dynasty Warriors games because you have to cut down thousands of enemies with healing/health pick ups few and far in between. I like to hack and slash through thousand of enemies and watch my kill count go up as little old me takes on an army all by myself. So if they made something like that for Kinect, I would have a blast swinging and slashing away.
That parkour game Mirror's Edge would be cool if you were running and jumping using the Kinect. I'd like to see more unique, artistic games like Child of Eden. Child of Eden really showed a creative use of the Kinect.