I just had a blast. I wasn't spoiled, so there was so much that I just really enjoyed, despite the attempts by interviewers and the like to force the actors into giving away too much. I didn't know they were going to bring back all the villians (except Venom and the two Harry Osborns), so when Jamie Foxx turned up in the 'no spoilers' that ran before the film, I was pleased to see we got a pretty damn close Sinister Six. But there was so much I liked. I enjoyed Daredevil turning up. I loved all three Peters together - but then Into the Spiderverse was a pure delight and this was a live action version of that. May's death hit hard because she's been the only other constant, and while I should have expected the switcheroo I didn't. I liked Doc Ock's redemption, because he was always the one who was least about being evil and more operating out of grief and despair. Lizard and Sandman got lost in the shuffle a bit, but getting crazy Willem Defoe back was a good replacement.
And of course there's all sorts of questions that can be asked that can be handwaved by 'well only a few slipped in' - so that's why no other MJs, for example. Out of the theatre, though, I now wonder what it means for the respective timelines that have changed because most of these characters are alive. The big one of course is Norman, considering how directly that leads to that Harry going nuts as well - but they were clearly taken from different points in the same universe's timelines, which has to fuck things up. They didn't have time, but imagine if they'd brought back Gwen and her Dad from the Amazing movies, and sending them back would mean sending them back to die. Or even a meet-up of surviving Mays. But they made a big point about how time travel fucks with the universe, so they've just fucked with the timelines of two other universes.
Also, I kept forgetting they got Rhys Ifans to play the Lizard in the Amazing film, so was half-expecting Dylan Baker instead.
But there were just so many bits I loved, and when all three of them were together I had a great time. Andrew Garfield especially was having a lot of fun, and the moment when his Peter got to save MCU's MJ really got me.
Basically, I got what I wanted out of it and then some, and the callbacks, references and reappearances really worked for me. The audience applauded several times during the film, when I saw it.