I think you are true to a point. But great movies get almost universal praise with scores of 9/10 on IMDb or near 100% on Rotten Tomatoes.

The same goes for food; there are things that are quite controversial, but who says no to fantastic ice cream or bread?

But most importantly for movies, it is not the micro-genre that decides. People who are not into fantasy or astrology still love Lord of the Rings or Interstellar because they are particularly highly produced, where all crafts making up that movie are treated highly instead of strategizing and optimizing.