I cannot imaging paying $60 fo this game, but as an add in it has some great things going on. It is much more fun when playing with multiple people and have some creative party games. The one players games are a bit boring, but a couple of them are suprisingly detailed. There are some good games to show you the Wii U's capabilities, but all in all I see it as a mini game compilation.
I wasn't expecting this to be as fun as it is, don't get me wrong I enjoyed the similar game released on the Wii but didn't think this would have nearly as much content as it does.
My kids played this game more than any of the 5 others they got for xmas (we did ours early) and didn't want to put it down when it was bed time. We still havn't gotten through half the games content but will over the next week or 2.
The "zelda" type game seemed to be their favorite since it required team work with the sword/shield and bow guys.
Luigi's ghost game i really liked because i got to chase my kids around and catch them (there is a mario game similar to this and it is just as fun on here)
Game is a 10 and if you haven't tried it then you really need to, great for all ages.