'cept that wouldn't be Kinect, as Kinect sits in front of you. For this to work you'd need a projector mounted on your ceiling - bit too expensive for too little for my liking ;)
I think on my side is not much about the techniques anymore, we had such advanced and improvement on the tools that we can get anything done nowadays. My main problem is the lack of creativity, ridiculous gameplay elements (not all, some) and terrible game design (level design, repetitivity, story) on titles that were once…