So I bought a Wii U(Mario and Luigi version) today for 3D World. I'm finding that I really really don't like 2D Mario games anymore. Like at all. Fortunately I also bought Zelda HD. Gonna tear that one up after 3D World. Hopefully find someone to buy Mario-Luigi off me and use the money towards Pikmin.
I'm kind of the opposite. Haven't had any interest in the NSMB series until U. Then I got Luigi U and I'll be getting NSMB 2 soon. They're great on off-TV play.
The 3D games are vastly superior though. But still, they offer some interesting platforming, and the level designs are always charming.