[spoiler] I really liked it. How can you not? But it definitely has some flaws. Infinity War was more or less consistently good, while this had parts that were either better or worse. Overall, I like Endgame more, just for its grandeur.
-The very beginning with everyone living in sorrow and grief was amazing. Tony as father was heartwarming
-The rest of the first act was very weak. Thor felt too changed and out of place. The jokes were weak here. Not as clever as usual.
-The time traveling was pure fan service and had very interesting stakes. The addition of a Past-Thanos and Past-Nebula as main antagonists was a clever choice and made it interesting
-Everything after that was, of course, epic. You can’t sit still. The final battle is just pure fun, you have to love it
-Captain Marvel felt underutilized, but that’s probably because she’s op, sooo...yeah[/spoiler]
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I think they also wanted the OG cast to have a worthwhile ending. It would be incredibly moronic for a new character to just win and the characters we have been following with 10 years not get a well earned victory.