Disclaimer: I only really watched MS, Sony's, Square's, and Nintendo's. A lil of Ubisoft, EA and the PC gamer conference as well.
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Microsoft [B+/A]: Microsoft was the first E3 conference I watched and wow, what a strong, pleasant start to the E3 week. I stayed up till 2am for this and I had no regrets. Not once was I blearily looking at the screen thinking 'Should I just go to bed now and watch this later?' (-coughNintendocough-)
MS dropped some heavy bombs pretty early on. Halo 5 gameplay, a new customizable controller (whaa?), and native 360 Backwards Compatibility (whaaattt!). It might be only limited to around 20 titles right now but at least it's something. At least it's a start. Seriously two thumbs up, MS. Good on you.
Aside from the usual suspects of Forza and Fable, they had new IPs to show off as well. Recore in particular, was just a CG trailer but it was a CG trailer with a lot of weight. When Keiji Inafune's name appeared across the screen, I flipped. A MS exclusive game and Spencer says it's the start of a new exclusive franchise. Exciting times.
The third parties that they had on stage were pretty dull and forgettable. Fallout 4 was already shown on Betheda's stage and Rainbow Siege didn't look like anything special. EA was a bore but the smattering of scattered clapping to Moore's NFL announcement made me lol. The Hololens segment though was really fun to watch. Unfortunately, everything felt far too staged imo-- the running commentary in my head just kept telling me that there is no way AR can be that smooth. Not anytime soon anyway. Kept getting flashbacks to Milo and the Star Wars kinect demo as well.
Indie showcase = strongest part of the conference imo. Ashen and Beyond Eyes being the standouts. Both are exclusive to the platform as well I think? Beautiful art styles, really cool ideas.
Gears kinda disappointingly ended it all off. Was expecting a grand old big 'one more thing' surprise but hey, I shouldn't have let myself get carried away with the pre-E3 hype right? (Ha.) I thought Gears showed poorly tbh. Was really dark and it was hard to make out what was happening at times.
All in all, a very solid conference. Had some good 'omg' moments. Had fun watching it. Made me feel excited for the week to come.
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Sony [A++] : Move aside Twilight Princess and 'No DRM'. This is the E3 of the forever. The one you'll be telling your kids about. The one people will keep pointing back to as one of the most magical moments of E3. THE ONE THAT DREAMS ARE MADE OF. YESSS TLG IS ALIVE AND WELL.
Games that people joke about. Games that everyone was certain were vaporware. Even with the rumblings that they might actually appear this E3, the rumours were mostly met with derisive laughter: 'Don't do this to yourself', 'Let it go, guys', 'You guys are crazy'. And then, boom.
All three. At once. In one conference. This does not happen. This. is. insane.
In this day and age, where everything is usually met with cynical skepticism, Sony's conference has managed to incite pure exhilaration. I have never witnessed a conference like this. People were up on their feet. Grown men and women laughing and crying. If you haven't watched the E3 reaction videos, you should. The passion that people have for these games were palpable and infectious.
They opened with TLG and after the gameplay was over, all I could think of was 'Well how the hell can they top
that?' Megatons aside, GG's Horizon might just be my Game of the Show. MM had a cute trailer for their new game Dreams but I still have no clue how that game will play. Is it just an animation studio maker or something? Ah well.
Vue and VR segments were short and sweet. The Disney Infinity part was awkward (felt bad for the guy). But Battlefront looks gorgeous and Arkham Knight was super as always. The COD thing might have been a big deal-- a show of tables turning but that whole section bored me.
UC4 closed it off and wow, what a demo. The driving section seems to hint that we'll be getting a more open UC than what we're used to. The witty banter is still in tact and that game looks gorgeous. No release date though. Boo.
TLG, FF7 remake and Shenmue 3. This is the E3 of legends.
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Nintendo [C-]: This was such a dull and disappointing conference. Could be because I was sleepy so I was being extra cranky but the week long directs really made the Digital Event feel super redundant.
Animal Crossing Party? Really, Nintendo? Starfox doesn't look too hot but at least the fans are happy. And Tri Force Heroes just deepened my disappointment. A multiplayer

() dungeon crawler (

( )? Not my thing.
I did enjoy listening to Miyamoto talk about how he designed the Mario levels though. That man is a genius.
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EA [C+]
Ubisoft [B-]
Square Enix [C+]