Didn't watch all of the pressers due to work, but overall it was a decent E3 for me! Not amazing, but not awful. Crucially though, nothing sold me on a Switch yet. Admittedly I have a lot of its games (BOTW, MK8, DKC:TF, Captain Toad) on Wii U already so it would only be new releases that interest me.
Earliest jump-on date for me would be Smash Ultimate which looks promising, but will need to see more. Mario Tennis and Odyssey are also tempting, but I'm not quite there yet when it comes to 'critical mass' before buying a new console. With Daemon X Machina in 2019 that moment will come closer.
Secondly, this is the first time I also watched the Xbox and Playstation conferences, since I anticipate wanting one of those consoles once Beyond Good & Evil 2 comes out (which might be 2020 earliest). Of those the Xbox presser impressed me more. Sony's games look very polished and interesting (Control, Ghost of Tsushima) but also very moody and violent. Xbox also had some colourful stuff with Tunic, Forza Horizon, Sable, Session, Ori Will 'o Wisp.