Just finished it. I have to say it started off kinda....less than stellar. The time travel stuff seemed a little like cheating and really not that creative. A lot of the dialog and jokes felt less clever than in previous films, too.
From the moment they got all of the Infinity Stones (remember when, in GotG2 it was so amazing that Peter held a stone and lived so he had to be a God?) the movie kicked it into overdrive and didn't look back. It was poetry. I'm sure, given a couple of hours, I could nitpick it all apart but for now, nothing but satisfied. I don't need another Marvel film for a long time.