Checking Argento's Inferno again--what can one say except that at his best he's directing opera more than anything else (that's why he keeps coming back to the theater in his films). Colors, music, gorgeous sets and costumes, all orchestrated and tautly designed to evoke terror and a ravishing of the senses, simultaneously (maybe--at his very best--a ravishing of the senses through terror).
Everything else falls by the wayside--plot, characterization, social commentary (I can almost hear him snorting at the very notion). Above all is the image, and its power to evoke powerfully primal emotions. This isn't a cinema for the brains, but for the gut, even gonads.