Chances are, if you're buying a 360, then you're not buying a lot of casual titles. The Wii has a stranglehold on the casual market, and Microsoft will probably want to keep portraying the "Second System" stereotype for the Wii, and will try to stay as "hardcore" as possible.
My Games of 2011:
The Legend of Zelda: Skyward Sword
Elder Scrolls V: Skyrim
Super Mario 3D Land
Uncharted 3: Drake's Deception