Having seen Avengers: Endgame once before, this was actually the category I was most dreading.
Avengers: Endgame is unlike some of the earlier Marvel movies in this respect, as its action, even during scenes with a lot of characters moving at once, is very smooth and engaging in 3D.
There’s a lot of action in this film, and scenes with a lot of movement typically have the most trouble in this category as action in 3D can often make people queasy.
If we gave half scores in this column, I might bump it to a 4.5 because of that, but that’s not enough of an issue for me to grade a 4 in this category, so 5 baby!