Martin Scorsese's 'Killers of the Flower Moon' wants to be epic but just feels long

There’s a difference between “long” and “epic,” although in movie terms the two frequently get confused. Martin Scorsese delivers the former but not the latter with “Killers of the Flower Moon,” his second consecutive three-and-a-half-hour movie derived from a true story and underwritten by a prestige-hungry streaming service.