My opinions so far (Ubi hasn't happened yet, missed the Nintendo stuff yesterday):
Bethesda is a clear winner so far, primarily for the Fallout 4 goodness. Microsoft was surprisingly not bad, and EA... holy Arceus, what a massive stinker. It was 98% cars, doll game, Garden Warfare, SPOOOOOORTS, mobile games, mushed mouth barely able to speak English speakers, and SPORRTS! The four things anyone would have wanted to see was the new Mass Effect (relegated to a minute long crappy teaser), The Old Republic free expansion (had a teaser that said to watch the actual trailer elsewhere), Mirror's Edge (Twitch stream crashed and didn't come back until its trailer ended), and Star Wars: Battlefront (saw only a bit before the Twitch stream crashed again).