I posted something about this on a mailing list earlier and I think it sums it up pretty well:

"This thing is kinda silly. He’s arguing that the kinect is getting the same complaints about shooters that console shooters had, which is that console shooters don’t give the responsiveness that a mouse/keyboard combo gets. The thing is, that point is still true to this day. The fact of the matter is that you have to create the game with a playstyle that works with console controls (i.e., Halo). The point about controls is irrelevant in the end because Halo doesn’t sell millions because it’s better on consoles than PCs. Halo sells better because having a console is more accessible than buying a $2000+ PC.

As far as his point about Kinect being able to do whatever and that people said the same as they did for console shooters, it’s a sidestep around the real questions people are asking about the Kinect, which, to be honest, is a pretty impressive piece of technology. It’s still worth asking though, how do you control stuff with this thing? They are coming out with a kart racer game and you can’t control the speed of your vehicle in it, you just always go forward. I don’t think that’s a very reassuring argument that you can do “anything” with the Kinect."