And yes . . . you'll notice that we decided to include non-Marvel movies in our rankings. I regret nothing about this.
(This list is always being updated, as new movies come out.)
1. Spider-Man: Homecoming
2. Iron Man 3
3. Spider-Man: No Way Home
4. Spider-Man: Far From Home
5. Shang-Chi and the Legend of the Ten Rings
6. Avengers: Infinity War
[n/r] Spider-Man Into the Spiderverse
7. Black Panther
8. Captain America: The Winter Soldier
9. Guardians of the Galaxy
[n/r] Deadpool
10. Captain America: The First Avenger
11. Thunderbolts*
12. Thor Ragnarok
13. Guardians of the Galaxy, Vol. 3
14. Black Widow
15. Avengers: Endgame
16. Ant-Man
17. Ant-Man and the Wasp
18. Captain America: Civil War
19. Iron Man
20. Deadpool & Wolverine
[n/r] Deadpool 2
21. Black Panther: Wakanda Forever
22. Thor
23. Guardians of the Galaxy, Vol. 2
24. The Avengers
25. The Marvels
26. Eternals
27. Captain Marvel
28. Iron Man 2
29. Avengers: Age of Ultron
30. Thor: Love and Thunder
31. Doctor Strange in the Multiverse of Madness
32. Doctor Strange
[n/a] Shazam!
33. Captain America: Brave New World
34. Thor: The Dark World
35. The Incredible Hulk (Ed Norton edition)
36. Ant-Man and the Wasp: Quantumania
Don't like our rankings? That's fine. I know there are others out there that will suit you better. Here is another web writers thoughts on the MCU phenomenon.
And what about the MCU TVverse?
I can't really scale them in the same list as the cinematic stories, so I'm creating a separate list here. (This includes the original ABC TV shows, the original Netflix shows, and the Disney+ series.)
1. Daredevil
2. Jessica Jones
3. Loki
4. She-Hulk: Attorney at Law
5. Agatha All Along
6. Daredevil: Born Again
7. What If . . . ?
8. Agent Carter
9. The Falcon and the Winter Soldier
10. WandaVision
11. Hawkeye
12. Ms. Marvel
13. The Punisher
14. Luke Cage
15. Defenders
16. Echo
17. Agents of S.H.I.E.L.D.
18. Iron Fist
19. Cloak & Dagger
20. Moon Knight
21. Runaways
22. Inhumans
23. Secret Invasion