I'd rank
Sony 6/10: Of course Uncharted saved the show from failure, but 40+ minutes on T.V. applications at a video game event is a sin. At the booth Bloodborne was shown to run at 15-20 frames per second so my hype for project beast was dashed. Grim Fandango remake sounded good and I know some people will love LBP3.
Microsoft 8/10: A complete 180 from the TV and Kinect E3 last year. Every slot was spent on games. The Platinum title Scalebound had me hyped and Sunset Overdrive looked fun. There were too many pre-rendered cinematic trailers though.
Nintendo 9/10: Star Fox revealed even before the digital event had me in tears. Smash tourney. Four new IPs were shown over the course of E3 and I cannot wait to drag lessers in TF2-esque Splatoon. Zelda, Yoshi, Bayonetta, and X all look great. The 23 hours of Treehouse demos should be emulated in everyone else's E3 next year. Metroid hinted at too.
Obviously biased but whatevs.