The show that first defined the Broadway musical has never come to the screen intact, despite three tries. But take this splashy 1951 MGM extravaganza on its own terms, and it boggles the eyes. Not to mention the ears: The Kern-Hammerstein score includes some staples of the American songbook, such as "Make Believe," "After the Ball," and "Can't Help Lovin' That Man." Perhaps a riverboat gambler is almost too-easy casting for Howard Keel, and Kathryn Grayson is overly twittery, which may be why the film's middle sags when they take center stage.