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Standard action movie plots are taken and masterfully brought to the point of absurdity. If it's a street war, it's not between gangs, but between a criminal syndicate and prostitutes, and the prostitutes stage a massacre against the mafia. If it's a severed head, it's so talkative that they have to tape its mouth shut.
"Deadly little Miho," "Do I take this cop down and risk it all?" - these rather vulgar phrases from mediocre action movies have become classics in "Sin City."

If you want to be strict, then yes, it's a separate genre - noir.