Critics also do not agree on what the lower ratings signify, let alone the lowest rating. While Maltin's and Scheuer's guides respectively explain that lowest rated films are "BOMB(s)" and "abysmal", British film critic Leslie Halliwell instead writes that no star "indicates a totally routine production or worse; such films may be watchable but are at least equally missable." Like Halliwell and Dave Kehr, film critic Jonathan Rosenbaum believes one-star films have some merit, however unlike Halliwell, Rosenbaum believes that no stars indicate a "worthless" movie. Roger Ebert occasionally gave zero stars to films he deemed "artistically inept and morally repugnant." Scheuer's guide calls "one and a half star" films "poor", and "one star" films "bad".