“Daddio” (*1/2 out of four) was a rambling melodrama about a world-weary taxi driver (Sean Penn) who picks up a passenger (Dakota Johnson) and the two engage in a series of conversations pontificating the meaning of life, relationships, and their existence. What may have worked as a two-character play or a film short is unbearably tedious at feature length and winds up a pointless waste of time. Johnson once again shows she’s a strong actress and holds the screen but Penn is at his mumbling and disheveled worst as the driver.