After watching all 3 presentations, I'd rank them as
1) Sony. Pretty long and boring. Speaker was horrible. Relied to much on the Home system. Chewbacca was just lame. The PSP redesign = weak. However, they ended very strong and have some very good looking games. I laughed at their 'time exclusives' though. And Epic putting "Gears of War" in the UT3 trailer.
2) Nintendo. They really should get someone to strengthen their presentations. They showed way too many montage videos prasing the Wii and barely any of the 100 Wii games coming out this year. They should not have ended with WiiFit. While I think the 'game' looks blah, the possibilities are interesting.
Imagine Wave Race with the floor board and a controller.
3) Microsoft. CoD4 looked great - but since PS3 has it, it diminished it alot. Theirs was the most boring. Too long on sales figures and just nothing really new. Even Halo 3 just doesn't create hype anymore
All in all though, mostly blah's all around. I'm curious to see what Nintendo is releasing next year though, since so many heavy hitters this fall. Plus, they technically did not verbally confrim Brawl as being online.
However, they did announce Medal of Honor online for the Wii with 32 people. That's a step in the right direction (Especially with the zapper).