Though the genre's invention (named after the yellow / giallo covers of
Italian penny dreadfuls) is credited to compatriot Mario Bava (see, especially, his astonishing Blood and Black Lace), Argento's scary polish and cunning for film language bridged the cultural, mainstream / arthouse gap with agility and audacity.
Not good art because they seldom have anything to say about the society that spawned them (and because the directors of these messes are generally assclowns) and not good travelogues, either, what these little straight - to - home
penny dreadfuls tend to be are tired variations on the same quasi-Christian mythos, tarted up with surprisingly good production values and the kind of cheap thrills that kept EC Comics, then Hammer Films, then
Italian giallos, in business.