Right now the Most Watched sections on the Year in Review page for Genres, Networks, Studios, Actors, and Directors are based on the total number of shows you have watched in that genre, but I find this to be wildly inaccurate. If I watch 100 episodes of a Science Fiction show, it still only counts as one point for Science Fiction, but if I watch a single episode of fifty different cartoons, it counts as fifty points for Animation.
It would be really nice to have a more accurate breakdown of our preferred categories based on how much we watch what. Just a toggle on the Year in Review page which dictates what math the page should be doing would do it.