That was sort of the point of the game, to show how multi-player games can be done "asynchronously" (meaning that one player is doing something completely different than the other players, yet still at the same time.)
Just another example of how Nintendo failed Marketing on this thing.
Of course, since I was at E3 in 2011 when they first revealed the Wii U, I played some of the demos that eventually turned into minigames in Nintendo Land. I'm looking forward to Game and Wario so I can play what "Shield Pose" turned into. (I'm not the one playing, I'm recording, but this is the game that I'm referring to...)