An antagonist can be classed on three orthogonal parameters: * How much danger they, or their plans, pose. * How effective they are. * How much the audience is supposed to hate them. This is a method of quantifying that third one. See also Sliding Scale of Anti-Heroes, for the bottom end of the Protagonist version of this list. See Likable Villain for a classification of reasons why not all villains are vile ones. The sliding scale is roughly as follows: