Brad Bird himself can be quoted from the first Incredible’s commentary track as being sick of people talking about the animation “genre,” but I think it’s fair to say that Pixar represents a particular aesthetic, including things like tone, visual style, and a distinct brand of storytelling. Pixar is every bit as descriptive as Tarantino, HBO, or Roald Dahl. You know what you’re getting into.
That being said, The Incredibles is obviously a superhero movie, even if it doesn’t conform to the empty pulp format of Marvel’s new world order. Neither did The Dark Knight.