For me, this E3 was the worst in recent memory. Maybe my expectations were too high but I think everybody besides Microsoft and Bethesda had better showings last year.

My personal ratings:

Microsoft: 9/10 - Conference setup and pace were close to perfect. We got a new Halo (even though that's probably a long way off), 3 Gears games and Forza Horizon 4. There were a lot of 3rd party games but I don't mind that when we're talking about games like Cyberpunk, Sekiro, Fallout 76, Metro Exodus, Tomb Raider, Devil May Cry 5, Dying Light 2 and Battlefield 5. Only thing missing was an exciting new IP or megaton revival like Perfect Dark or Fable.

Bethesda: 8/10 - Conference was held back by a dull rock concert and too many awkward pauses. Content was top notch though. Bethesda fans literally got everything. New chapters announced in Fallout, The Elder Scrolls, DOOM, Wolfenstein and Rage as well as an exciting new IP in Starfield. Better conference setup and more gameplay in general would've improved the rating.

Ubisoft: 7.5/10 - Conference was top notch but content was a little lacking. Maybe I'm just being spoiled but Ubisoft usually ends the conference by announcing either a big new IP or a megaton revival. I admire that they show so much gameplay but it mostly felt like updates for already announced or released games. If they hadn't leaked/shown The Division 2, Assassin's Creed Odyssey, The Crew 2 and Mario + Rabbids: Donkey Kong Adventures beforehand and had shown gameplay of Beyond Good & Evil 2, it would've been close to a 9/10 for me. With Splinter Cell or a big new IP on top would've made it a 10/10.

Sony: 7/10 - Conference was held back by weird setup and pace. They had the winning formula in 2015 and 2016 but for some reason decided to focus on very few games and unnecessary talks (without the actual developers). I really liked what I saw from TLOU2, Ghost, Spider-Man, Days Gone, Resident Evil 2, Control and Nioh 2 but what makes me primarily a PlayStation gamer is the variety of the (exclusive) library. Sony has so many varied games coming up but for some reason they only want to focus on their 3rd person action games. What about Spyro, MediEvil Remake, the secret Bluepoint game, Babylon's Fall, FF7 Remake, Shenmue 3, Yakuza 6, Ace Combat 7, Dead or Alive 6, GT Sport's Summer update, Concrete Genie, Blood and Truth, Déraciné, etc. If we had had less talk, more games and that 1 huge surprise (RE2 was already announced), the rating would've been better.

Nintendo: 5/10 - This could've been a Smash Bros. Direct. I liked the extensive look at Smash Bros. Ultimate. It really is shaping up to be the ultimate fighting game with a huge number of characters and details. With that said I'm somewhat disappointed that it's a port of Smash 4 with some extra content and updated graphics. Beside from Super Mario Party, we didn't really get anything new. If we'd seen anything from Pokémon 2019, Metroid Prime 4, Bayonetta 3, Shin Megami Tensei V, Yo-kai Watch 4, Good-Feel's new Yoshi game or Retro's new game, the rating would've easily been better.

Square Enix: 4/10 - My expectations were high for SE's conference because of their broad and varied library of both Japanese and Western games. I thought they would go all in and bring KH3, FF7 Remake, DQ XI, DQ Builders 2, Shadow of the Tomb Raider, Just Cause 4, Life is Stange 2, The Avengers Project, Left Alive, and People Can Fly's AAA shooter but we only got 4 of those. Platinum's Babylon's Fall looked promising but it was the only new announcement. If they hadn't leaked/shown everything else beforehand, the rating would've been better.

EA: 3/10 - At this point, I don't even think EA is trying to cater to gamers. Their conferences feel like reruns with the same boring talk about this year's "revolutionary" sports titles. They sit on so many great IPs (rip C&C) and sometimes they even have the content to make an interesting show but.. they're just not capable of delivering. They're just a bunch of uncreative and investor-driven suits who invite indie developers in the hope of giving the show some kind of pulse and personality. As a huge fan of the Jedi Knight-series, I hope Respawn's Star Wars: Jedi Fallen Order will be a worthy spiritual successor but I won't hold my breath. I know there are many fans of the sports titles and Battlefield, Anthem and the indie games could turn out worthwhile. Though in order to go higher than 3/10, EA would have to actually make an effort regarding the setup, pace and content of the conference.

Sony. The strongest lineup.

I've watched them all except Microsoft's and Nintendo's, which I'll watch tonight. All, but Sony's so far were really meh. I was really happy with all the gameplay Sony showed, but wish there was more. Hopefully they have some bangers for PGW and PSX.

I copied and pasted my post from another similar thread to this one.

Out of the big three I watched, here is my opinion.

MICROSOFT 8/10 - Showed promising upcoming games, new announcements, reviving old games, brought and created promising studios, entertaining conference.

PLAYSTATION 5/10 - Nothing new, what they showed was good but no new games, no old 1st party game revivals and the conference itself was a mess. Needed more than just the rince and repeat method and relying on 3rd Party games to carry the show.

NINTENDO 4/10 - Pokémon and Smash Bros are the only reason to watch the show, they deserved 2 points for each game however too much was missing and nothing to spark interests.

Bethesda had the most new games I'd probably want to try/play, so I liked their conference the best. Wolfenstein, doom, fallout, rage. Funny video making fun of Skyrim ports and a nice tease of games coming in 2020 or later.

I enjoyed watching the gameplay from Sony's exclusives but I'm not going to lie, those are my type of games (3rd person action games). But Microsoft conference was better orchestrated. Great job for both of them

Enjoy? Devolver Digital by a mile. Their satirical industry call-out against lootboxes and making fun of "live player demonstrations" was easily was the most enjoyable conference. They were the only conference that was actually entertaining so I have no idea why nobody is voting for them. Do people not enjoy satire?

I only watched Sony's and Nintendo's events and both were really boring to me, but if I had to choose a "favorite" I'd go with Sony's because of the amazing KH3 trailer and Spider-Man looked fun,

eh, this E3 was pretty, meh. Sony was the most interesting for me because KH3, Ghost of tsushima, and Spiderman.

I only watched 4 or so of them and wasn't overly impressed with any. If Sony would have given some release dates that probably would've been enough to push them over the top, but they didn't, so then I was left with little to be excited about (though the game made by Remedy made me happy).
Nintendo didn't announce any new games I plan on buying, so... I dunno. I know people are excited about Smash, but that's not for me. Would've loved Metroid info.
Square's was just wildly disappointing and I dont even want to discuss it.
I'm not interested in online only Fallout, OR fast gunplay like Doom and Wolfenstein. Elder Scrolls showed essentially nothing, so *shrug*
I guess I would say Microsofts was the least disappointing, even though no Alan Wake 2. Everything I cared about was multiplat I think, but maybe I'll get back into Gears or Halo, I dunno. I did buy Ori 1 after the conference and hopefully will like it enough to get hyped for Ori 2. They also showed Cyberpunk, though I was disappointed in the trailer for it.

*Edit* - I forgot about EA. There's a reason that was easy to do.

So I guess I probably liked Microsoft's the best, then Sony, but neither were loved, and so I'm not going to vote for them....