Watched all of them, IMO;
Microsoft: They lacked harcore games, no new unveilings and only games we all knew about. Kinect is a lame name, all the games they showed were typical Wii-like shovelwares. Only good ones are Your Shape from Ubi and Dance Central from Harmonix. Kinect has a terrible lag as well, and 150$ price point? No way. They just upset their "core" audience with this show.
Nintendo: LOL, totally not appealing to me. Maybe for children. I also like how they didn't allow any picture/video from 3DS screen.
Sony: Again, the winner of this E3. They have an incredible line-up for both Move and core-PS3, and the content they showed were amazing. I think 3D technology is nice but needs some time to mature from price point of view. Kevin Butler and Gabe Newell were the high points. It's good to know GT5 is finally coming for real.