Starting with Captain America: The First Avenger, and continuing all the way until today, Marvel’s movies have a lack of “proper black value” which creates a notable lack of contrast, thus flattening and dulling the visuals.
That video perfectly articulates the main issues that we have with the visuals in the Marvel Cinematic Universe.
The issue first reared its head all the way back during Phase 1, when Marvel switched from film to digital technology to shoot its movies.
Although the visual effects in most Marvel movies look amazing, the ugly color grading has a tendency to overshadow beautifully executed cinematography and CGI.
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Why Do Marvel's Movies Look Kind of Ugly? (video essay)