This is by far the MCU's darkest and mature film. The action has become more gritty, realistic and violent. The acting has gotten more serious with some humour thrown in for comic relief. Themes are no longer childish and involves terrorism, death, betrayal, politics and vengeance. The writing no longer panders to children, but to all demographics. Overall, the quality has improved drastically from previous MCU entries in writing, acting, direction and technical aspects. However, the film isn't dark and serious like Nolan's Batman because it sticks to its comic book roots and is able to distinguish itself, and not become generic. This is up there with The Dark Knight and Spider-Man 2 for best cbm ever made.