The actors and actresses. In a word: performances.
I've said it this before, and it remains true (and doubtless always will): a great film, for me -- much like a great stage play -- unfailingly equals at least one top-notch, forever memorable acting job. In this, I tend to value the director of any given picture considerably less than do most film aficionados. With the obvious exceptions of the very few outright geniuses (Kurosawa, Renoir, etc. -- you surely know the list), a film's director is, from my POV, chiefly a technician; whereas the actor(s)/actress(es) are the essential magic and allure.
I've said it this before, and it remains true (and doubtless always will): a great film, for me -- much like a great stage play -- unfailingly equals at least one top-notch, forever memorable acting job. In this, I tend to value the director of any given picture considerably less than do most film aficionados. With the obvious exceptions of the very few outright geniuses (Kurosawa, Renoir, etc. -- you surely know the list), a film's director is, from my POV, chiefly a technician; whereas the actor(s)/actress(es) are the essential magic and allure.