If Mario 3D world is one of the worst 3D Mario's, then New U is one of the worst 2D Mario's. The gameplay is sloppy, but more importantly the levels and many of the boss fights are just poorly designed. I haven't played 2D Mario since the SNES and was looking forward to this game. It's a shame this is what Mario has become.
Got this game bundled with my Wii U, it might not be very original but it was all I needed at the time. Really enjoyed the new stuff such as the Baby Yoshi's and the new music, and New Super Luigi U was more of a fresh take on the series as a bonus. Enjoyed beating both, but I'll admit there is not that much to be said about these games.