Obvious, petty mudslinging aside, it goes without saying that a control-system like Kinect or the Eyetoy are going to be limited to shallow gameplay. They simply lack the fundamentals to input complex directions that a controller with buttons provides. Even Move suffers because it still compromises on the number of buttons or analog sticks for input in exchange for the motion control.
The potential control applications with motion-based systems hit a wall when movement alone cannot allow for an easy enough transfer of detailed information based on the limitations of being confined to the camera or motion controller restrictions. One cannot accurately have a simple control scheme to double jump, roundhouse kick an enemy across the room, and land sword-tip down on a second opponent using a camera tracking device. The Wii-mote and the sexSony Wand have buttons to allow some more leeway for the user's limitations, it still is going to feel weird trying to mix both motion-control and button-pressing in some scenarios.
While I am no fan of either Microsoft's or Sony's motion peripherals, I give credit to Sony for at least maintaining a growing base of games not strictly reliant on Move. As an owner of both systems, I feel as though Microsoft is neglecting any other facet of gaming besides Kinect and its launch titles while riding on the scant remainder of "AAA" titles it has to offer. I do not pay for Live, making Halo Reach a rental, and I found Fable III to be worse than its former title[footnote]I enjoyed Fable II for what it is and had a decent enough time with it.[/footnote], so I am left with the impression that Microsoft is laser-targeting most of its resources on its gamble on Kinect.