But she LOVES bowling on the Wii.
And after playing it some, I now see how this works. It is the ultimate party game. You get everyone involved, bouncing around and laughing. It is a natural ice breaker with no "what card can I play now?" questions. It is just pure fun.
So my XBox 360 lives in peace with the Wii, and I am now happy throwing a virtual ball rather than bullets every time.