Yet with his perfect haircut and clothes, and his blank, trying-to-look-tough expression, Affleck seems less like the real thing in "Live By Night" and more like a wealthy person attending a Thirties' gangster theme party. [...] as the other actors feel more at home in the period milieu than Affleck does, one must wonder how "Live By Night" might have fared with brother Casey Affleck in the lead. The trauma, the bitterness, the crookedness, the conscience - these all might have been second nature - and we already know Casey can seem tough, from his starring role in brother Ben's directorial debut, "Gone, Baby, Gone." In the case of Fanning, Affleck gives her a series of penetrating close-ups that give you a privileged glimpse into a young woman's odd charm and inner turmoil. [...] here's the truth, and it says something impressive about Affleck, because he directed every one of these people, and he's the one who approved the cut: