Even though it's impossible to "win" a gaming conference, I liked Nintendo and Microsoft's showings the most. Nintendo had the most surprises and Microsoft just had a loooot of games. Sony's was the weakest by far.
My Games of 2011:
The Legend of Zelda: Skyward Sword
Elder Scrolls V: Skyrim
Super Mario 3D Land
Uncharted 3: Drake's Deception