The big critique of controller schemes: They're too artificial. Game designers take organic, fluid, physical real-life movements and turn them into random, opaque button combinations. This drives newbies away because they can't penetrate the button-combo thicket.
Indeed, this is precisely why critics have been slavering over the Wii for the last two years. Swinging your arm around is a more "realistic" holodeckian control scheme, so it is fated to eventually replace the crude, artificial controller. The controller is the ancient past of games; "sensing" your physical movements is the future. Right?