To me, they weren't.
I'm very used to the control stick, instead of holding down X to run.
And as soon as you jump, you have limited controls to Mario, unlike in the N64 version, where I have perfect control over Mario, no matter what.
Yeah, I agree. The original just has such a cool and old feel to it. Also, in the original, you get to play with mario's face, while in the DS version, you cant. You just SEE his face, you cant play with it.