I've played every Mario game out there and I'll say this - SMB2 is vastly underrated. Its divergence from the traditional platformer elements of the series is probably why it doesn't get the credit it deserves. But that's what makes it stand out - the uniqueness of the dream world, …
The nostalgic easter eggs are all over the place, like when you hit the big steel blocks and it makes the classic coin collecting sound! Or pounding the ground and hearing that distinctive thud from 64!