[MENTION=27138]Skylark Jones[/MENTION], I'm still waiting for the mysterious new franchise that will kick the Wii U into gear, but I'll admit that the Mario games for the Wii U, particularly 3D World, are indeed very good. You may also like DKC: Tropical Freeze if you enjoyed DKC Returns. I'm afraid that, except for Kung Fu Rabbit, I have no other titles to recommend at this time. Even then, that's not a console exclusive, which defeats the purpose if you have a Vita or wouldn't mind playing it on a mobile device.
I've played through some like TANK! TANK! TANK!, Blok Drop U and have dabbled in The Wonderful 101 and Warriors Orochi 3, but I'm afraid their quality is dubious at best. If you're strapped for cash, I would wait to pick up a Wii U but, if your Wii isn't working any more or if there are still some hidden gems on the Wii you would like to try, then by all means consider it.