PC Gaming won it for me; good game reveals and good presentation (if felt like something you'd see on early G4).
Mircorsoft didn't do anything for me, sure they had game reveals, but how many of them where exclusives, and how many of them would you actually buy and play.
Bethesda had Doom, that's it for me. Elder Scrolls 6 is just going to be Skyrim 2 with more farming and crafting like Fallout 4. Fallout 76 is gonna be a shit show.
Sony is ok, some good games where shown, decent exclusives, but presentation was sloppy and super dry.
Nintendo was ok, Smash was fairly hype, FE with actual armies seems neat, Mario party returning to form is nice. I just feel like there was more that could of been initially revealed (I know they're gonna talk more as E3 goes on but still).
Ubi had BG&E 2 Jade reveal, but that was it for me. Not into Mario and Rabbids so DK did nothing and the Starlink thing didn't do much more me either.
EA is EA.