Marvel what happened?????? (massive spoilers)

Rating: 7/10 (26 April 2019)

What happened to the deep relatable character of Thanos?
Why is Thanos extremely overpowered now?
What happened to Thor one-shotting Thanos?
What the hell happened to Hulk?
Why didn't we get closure on the Bruce Banner - Black Widow story?
How could Captain America travel back in time without switching timelines?
What happened to the Avengers having to team up and defeat Thanos in an intelligent manner?
All in all this movie provided quite some closure in a decently satisfactory manner. But it could have been so much better. The start of this movie contained too much silly humor in my opinion. Thor and Hulk have been turned into ridiculous comic relief characters. In the second half of the movie it got a little bit better.
Thanos sucks. When he died at the beginning it was like he got replaced by a completely different character. All of his character development in Infinity War was gone and he was turned into a mindless brute that felt like a side-villain to me. Also, why could Thor defeat him easily in Infinity War when he had all of the Infinity Stones but didn't stand a chance now? Ok, maybe it's because he got out of shape. Then why couldn't Captain Marvel defeat him? Wasn't she supposed to be even more powerful than Thor?
To me it seemed like they threw all of Thors character development out of the window. Throughout Ragnarok and Infinity War he became super powerful and got to the top of his game and changed into a true king. I was hoping to see him unleash that insane power in Endgame. Instead, he changed into a total fool.
The end battle is cool. It was nice to see all the characters uniting in one last battle. Captain America wielding Mjolnir is awesome. Apart from those things, it was pretty mindnumbing. Even the end battle in the cartoon tv-series was better. There everybody had to come together and use their unique strengths to defeat Thanos one stone at a time. In Avengers 1, Age of Ultron and Civil War the Avengers were a mess that was falling apart. I was hoping to see them unite harmoniously as a team once and for all in this movie. That didn't happen.
Tony Stark and Captain America got closure in a reasonably satisfactory manner. I always imagined Captain America going back to his own time to live out his life. Sadly this is followed by a huge plothole. Tony Stark is arguably the protagonist of the MCU and his ending was beautiful. Using the infinity stones was his destiny.