I'll go with 8/10
It's unfortunate that Microsoft didn't address its controversies, but the games were there.
Dead Rising 3 and Killer Instinct look like a lot of fun, and Titanfall was a show-stopper. Ryse looks a bit too scripted and QTE-heavy for my tastes, but the graphics are impressive. I'm less interested in Sunset Overdrive, Quantum Break, and Project Spark. A lot of the most interesting games are multiplatform, but that's bound to happen.
Like I wrote in kowenicki's thread, the changes to Xbox Live might be the best part of the conference. Two free games per month? Sign me up.