I side with Deezer. The "revolutionary touch-screen control" was so crappy that I had to use the D-pad the whole game. Here's what I said when I first got the game.
"the touch screen support absolutely sucked. SUCKED. i'd rather move mario with the d-pad! nintendo really screwed up on this one, that's for sure. to run mario, you touch the screen and a bullseye-like thing appears, with your stylus/finger at the center. most of everything around it is a deadspot(mario barely moves), then there's a thin strip on the outside where you put the pen to make mario run. kinda like the N64 stick, you place the pen in correlation to where it would be on SM64. now, this is fine and dandy if you can see where you're pointing, but chances are you're looking at the game screen instead(watch the touch screen, fall off a cliff. get it?)! now, this might not be so bad if the virtual "stick" held in one spot and you could just get your hand in a comfortable spot and get used to it that way. but no, it gets worse. eveyrtime you move the pen outside of that thin band used to make mario run, the "stick" moves that much. which means even if you have your hand in a comfortable spot, you'll have to move it once you notice that the center has also moved. there's no way to tell how much it moved without looking at it, and looking at it means once again taking your eyes off the bob-omb about to blow up in your face and using them to chase that stupid stick around the screen.
it just plain SUCKS."