I have to not so humbly disagree. Sony definitely won E3 between new IPs like Horizon: Zero Dawn, the next Uncharted, the FF7 remake, the Shenmue 3 announcement (even if I've never played the games, yay for the fans!), and THE LAST GUARDIAN! Huzzah! The only thing that could have been better if they also announced Resident Evil 7 (and it was scary this time) and The Last Of Us 2.
Microsoft would take a close second. They came out with a lot of cool games, and honestly, that backwards compatability is so impressive and something Sony doesn't have. I hope Sony steps their game up and does the same, because competition breeds innovation.
And Nintendo... Well, it was kind of same games, different year. I mean, it's probably going to be another decade plus until the Big N has another new IP, so lock in everyone and sing along, "Mario, Zelda, Metroid, whee. Donkey Kong, Star Fox, Smash Bros, hehe."