Nintendo > Sony > Microsoft.
Nintendo- 9/10
This was brilliant. They showed loads of gameplay footage (exclusive gameplay footage), the 3DS description was a little wordy but still very good, and ZELDA and GOLDENEYE.
Sony- 7/10
The big shock here was the lack of Last Guardian. Too much time was devoted to Move, and there really should have been more about exclusives. On the other hand, KZ3 and LBP2 had some nice footage. Sorcery looks very interesting. Kevin Butler and Gabe Newell. Twisted Metal. PSN is affordable and free for three months. So, it wasn't all bad.
Microsoft- 5/10
Pretty much everything they showed for Kinect was a Wii rip-off. And most of it looked pretty ridiculous. Pretty much the entire conference was devoted to Kinect. But the 360 Slim was good. The Halo: Reach trailer was pretty decent. Most of the core games were pretty good. There was just hardly any of them.
(Former) Lead Moderator and (Eternal) VGC Detective 
