Like:
1) Fat Thor. So the legend is true.
2) How they were able to link back to lot of the key moments in previous Marvel movies, such as Thor 2, First Avenger, Captain America 2.
3) Some scenes really hit them feelings, teary. For me it's Tony hugging his dad, Capt looking at Peggy in the next room, Thor meeting his mum.
4) Cap wielding Thor's Hammer. This scene gives me goosebumps.
5) The scene with Cap in the lift. I thought they will act out the lift fighting scene again. Then sudd Cap say Hail Hydra. This is the best easter egg imo. It's the Captain America comic book cover for 1 of the volume. LOL
6) Not giving Captain Marvel the final blow to Thanos. I friggin hate Brie Larson and her SJW issue.
7) Finally showing how truly powerful is Scarlett Witch. She is very strong in the comics. And they finally give her what she deserves.
8) The scene where Scarlet Witch talk to Hawkeye. They are the ones who lost someone permanently.
9) Cap yelling Avengers Assemble!

Dislike:
1) The scene where Captain Marvel take the gaunlet from Spiderman. If u notice, all the female superheroes appear after that. It's like purposely portraying female power. Like hidden SJW message.
2) Sam Wilson as the next cap. Also felt a bit SJW message. That scene would have been so cool if Sam throw the shield at Bucky, then Bucky catch it with his Vibranium arm. That would be a super cool easter egg to Civil War.
i also thought winter soldier is a more appropriate CA then SW.

Plot / plot holes?
1) If Capt travel back and had a relationship with Peggy. Then does Sharon still exist in the end?  sharon is a niece or something right? daughter or granddaughter meh? forgot.
2) Why is present Nebula still alive after killing herself? (she didn really kill her old self? Maybe just injured her?) i think as many mention, everything in the past does not affect the current timeline. even if it did, it runs a different path and not affecting current timeline. but if by same logic, then anyone can just bring BW, RDJ, etc from the past to current timeline and they would be revived.
3) How did Capt return the soul stone? Just leave it at Vormir? At the lake? Is it that simple? Does it require sacrificing someone to return it?
4) When Strange showed 1 finger to Ironman, how does Ironman know it is him that needs to snap? Strange just mentioned to him earlier he is not telling Ironman how they will win. So what did that signal meant??? i think strange meant only 1 needs to die.