I'm about halfway through now, and its ok. I feel like there's more talking. Though it's been a while since I played the first, so it might be the same amount. But it's certainly less amusing.
It's far mroe linear, it's apparently shorter, and sometimesi the controls are annoying. And the puzzles are simpler, from what I can tell.
In order to use the spin jump, you have to press X to throw the babies off, A to make Mario jump for no reason so you can control him, R to switcch to specials, then B twice to actually perform the move. Stuff like that irritates me. And Select goes unused for some reason.