I may not be 100% successful with this, and I'm rewatching them all so the ranking may change.
This is from Iron Man 1 and the start of the Infinity Saga up to Avengers: Endgame.
Tweaks incoming based on rewatches.
Iron Man ****
Captain America ****
Iron Man 2 ***1/2
Iron Man 3 ****
Thor 2 **