I'm going to give all of them tiers, since choosing one over the other gets too hard.
A+++: Endgame, Captain Marvel, Civil War, Winter Soldier
A++: Infinity War, Thor Ragnarok, Spiderman, Black Panther
A+: Guardians 1, Guardians 2, Iron Man 1
A-: Avengers 1, Age of Ultron, Ant Man 2, Dr. Strange
B: Captain America 1
(D)C: Thor 1, Hulk 1, Iron Man 3
Haven't watched: Ant Man 1, Iron Man 2, Thor 2