I've said it before and I'll say it again: GOTG have the smoothest, most planned, movie series with a satisfying ending.
- the main male lead and female lead doesn't have to end up together
- endings doesn't have to be tragic or sad to be remarkable
- heroes deserve to be saved too
- people change, and that's okay
- keep the character arc constant throughout different movies
- give villain's minions some character and thoughts. When High Revolutionary's subordinate went against him? And that Ura girl? Amazing.
- some villains can have no sob backstory and justification of what they done and still be a good villain (story-wise), and audience don't need to empathize. It's ok if they just want to cheer heroes as they kick the villain's ass
- You can make good jokes WITHOUT undermining the emotional aspect. Go ahead, joke, but know where to stop. I feel that's what new MCU movies lacked lately.