Whoa that was a lot to take in. This will need some time to settle and possibly a 2nd viewing before a proper review. The first act was possibly the best dark comedy ever, the second was the fun fan service reminiscing time heist, and the third was the epic final battle and conclusion to the series and many character arcs. Very ambitious and very well done.
My favourite part was obviously Cap wielding the hammer. I actually said this to my wife during the scene: