Well, if you ask me. Nintendo underestimated the analog control of the touch screen.
The original DS shipped with a wrist strap, and on it was a thumb stylus. When I played Super Mario 64 DS, I chose "Touch Mode" as the control option and controlled Mario by sliding the thumb stylus around the touch screen. The control was actually smooth and I can move Mario around without many hitches.
3D games can work by having all the action taking place at the top screen and use the touch screen to house a map/options/radar or whatever and let the player move the character using the thumb stylus. Given the number of people who have used laptops, it shouldn't be hard to learn.
However, when the DS lite was released, Nintendo actually dropped the thumb stylus from the packaging, thus most DS players are denied that control option!
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