Nick Hornby’s most famous surrogate remains Rob Gordon, John Cusack’s musical obsessive in High Fidelity, the patron saint of record store assholes and stalled-adolescent gatekeepers of taste. Hornby has since carved out a strong second career as a screenwriter, but the adaptations of his books continue: easygoing rom-com Juliet, Naked gives us another pop culture snob, played in a less sardonic key, but relegates him to the sideline of the central serendipitous romance. Chris O’Dowd plays Duncan, a media lecturer in a small seaside town outside London who is devoted to the work and mythos of Tucker Crowe, a Jeff Buckley-esque…