Downloaded it last night and played the first couple levels. Levels are interesting so far, but my one complaint is one I knew I'd have, having played the 3DS one and that is it can be hard to tell where to jump. With 3D, it makes it much easier to land on a Goomba.
I'm glad I'm not the only one who feels this way. 3D Land was nearly perfect for that reason. I keep wishing I had a 3D slider in this game, it would be three million times better, by a conservative estimate.