Actually, it's pretty hard to play NDS game with a stylus in the busses by here. Like you need to be precise, but as it moves too much, you can't be precise.
That's something that botter me, there's a lot of way to exploit the touch screen, but it would be nice if it was exploited with original idea. I like how you can organize thing in inventory, or how it can be faster to makes event appear (New super mario bros). But having to play a game only with the stylus (while it could be possible to play it with the D-Pad) is a big turn off for me (in both meaning of a "turn-off")