I downloaded and played a little tonight.
I have to say that this game is the ugliest piece of software I have seen in a long, long time. Nintendo put no time into making it look "HD" or "next-gen", or just plain interesting. As I said in the Wii Fit thread (it's the same) they could have kept the fun style but made it a little more flashy or just plain different to the old Wii Sports.
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I'm amazed Nintendo didn't allow you to take a photo of your face and map it onto the Mii's on Wii U ...it worked so well on Face Raiders 3DS when they allowed you to map faces onto the enemies and then animated the faces. Really funny.
I'm surprised Nintendo didn't make that standard for next gen Mii's as it would have really set them apart.
Face Raiders seems to be the only game they used the tech on..which is a real shame..