It's all about whether the camera loves you, which in turn is about whether all those eyes sitting there in the dark will be contented gazing upon you.
Acting, as distinct from creating the work to be presented, is about LOOKS. All the BS about how tough it is to be a "good" actor is just that -- BS. Brad Pitt is not famous because of his acting chops. He's famous because he makes women drool.
By the way many actors recognize this truth about their industry. Spencer Tracy, Anthony Hopkins, Bruce Willis, Marlon Brando and Henry Fonda have all made remarked about the extreme and literal superficiality of the acting "profession."
He also brings a modicum of borderline incest to said table.