A breakthrough picture for Argento. His prior films were stylized giallos with enticing titles but they were, to a certain extent, bound by genre convention. That is, they played by the rules. "Deep Red" was louder, nastier, more violent, more irrational than anything he had done before. It threw down a gauntlet that other filmmakers, including extremists such as Lucio Fulci, would be inclined to pick up in ways that redefined sadistic cinema for better or worse.
Glenn Kenny
April 25, 2016