It should be mentioned that the Xbox One has some positive features. For example, sharing your entire installed game collection with ten people on ten different consoles at the same time (though you can't play the same game concurrently). And. . .uh. . . Well, I'm blanking on anything else.
In my opinion, with Sony's improved online infrastructure, the only reason to buy an Xbox One is because you're a huge Halo or Forza fan, or because you're heavily invested in the Xbox community. Sony may not have displayed as many PS4 exclusives at E3 as MS, but history shows they can be depended on for more, quality games in the future. For all they showed, the only Microsoft exclusive I thought was interesting was Project Sparkle (or Spark?). It may have even been a contender to LittleBIGplanet if its art style wasn't so generic.
The best part of E3, without a doubt, was the very beginning: Metal Gear Solid 5! I really hope it comes to PC.