I just beat World 8, and while overall I'm liking the game, the physics governing jumping are really irking the shit out of me. I'm constantly falling short on jumps I know I'd be making in any other Mario game, 3D or otherwise. He seems to lose a lot more forward momentum when jumping than he ever has before, which is bugging the hell out of me because I inevitably don't even come close to hitting the top of the flag pole without the tanooki suit, and end up falling down holes on really easy jumps.
There is a stark difference between run and max run in jump distances while the difference in their animations is slight. Try giving those jumps an extra half-second of run time and you should see the difference.