I found the original New Super Mario Bros. to be disappointing. Massively so, that I have not bought a single one since. It seemed stripped down compared to the classics, with a fresh coat of paint being the only thing it had going for it. Even the old mechanics weren't used in too many original ways.
Are any of the new ones any more creative? I've seen Super Mario Maker use old mechanics in some pretty interesting ways in the prebuilt levels.
<EDIT> I completely forgot about this alt!