The top-sellinggamesofDecemberwereNewSuperMarioBros.Wii (2.82 million), followed by Wii Fit Plus (2.41 million), followed by Wii Sports Resort (1.79 million).
Unfortunately, while it's less of a defined experience than something like the sword game on Wii Sports Resort, you're still working through a library of sensed, pre-defined actions instead of a true 1:1 fighting game with simulated physics.