So, I just got Mario Kart 8, and I must say, its a far superior product to Mario Kart 7. Controls are good, plenty of characters, really cool maps. The characters are easy to unlock, just get first place in any grand pix, doesn't matter what level. Haven't got to Rainbow Road yet, and I really hope its good. The Wii U Controller does a fine job, and you can choose between "turn the controller to turn controls" or just use the joysticks, which I think is better.
EDIT: Also, seeing Bowser on a bike is pretty hilarious.