Exactly. I think part of it is the lack of surprise. Even the games that weren't officially announced like Wolfenstein, we have known is happening for months, alongside the title and concept. That is just one example. Outside of Metroid (which is hard to get excited for as one of the games is handheld and the other showed us a teaser that only featured the title) was there a single game at E3 that was a genuine surprise?
Also, where are the whales? Where is Red Dead Redemption 2? Halo? Metal Gear? RE2Make? The Last of Us? Just that one big triple A title that makes me say "hell yes!" It just wasn't there. I mean, hell, Sony didn't even show the FFVII remake, the first episode of which is just a few months away.
Now this may come down to the simple fact that the back half of 2017 is shaping up to be a very underwhelming year in gaming. All the big titles were released early on it seems (Mass Effect, Zelda, Resident Evil 7, Prey, etc) and were all Q1 and Q2 releases. This year does seem to be really front loaded. Maybe there just wasn't a lot to show for that reason?
But if that's the case: create hype! For example, I know it is a long way out, but show Elder Scrolls 6, even if only a trailer that reveals the title/most basic concept (kind of like Skyrim's first trailer which was just a bunch of stone engravings, some dialogue, and then the reveal of the name). Give the fans something to speculate about, get excited for, build hype.