I know it's not according to the game, but I believe Bethesda won E3.
Doom looked amazing and with id Tech behind it, it could easily be one of the best FPS to come. Fallout 4 looked really great: a talking protagonist, the robot which can actually speak names you've given your characters, costumizable weapons, houses and power armor, jetpacks, huge Boston area. Dishonered 2, the first game was probably one of the best stealth games in recent memory and if the game looks anything like the trailer, we're in for a treat.
EA had Battlefront, but that's about it. Sony and Microsoft had some interesting new IP's and Sony had some big announcements. But I'm dedacting points for the Shenmue 3 kickstarter and timed exclusivety of FFVII, The Last Guardian looked cool though. Ubisoft announced a new South Park game and some more Ubisoft games (you know, the Ubisoft games). Nintendo... had a fun conference... Star Fox looked nice... that was about it, not enough new big games.
So yeah, I think Ubisoft had the biggest announcements.
