Yet another psychological problem mathematicians too eagerly claimed as their own. Why not try to find patterns about the movies which appeal to a certain individual? Is it against the rules to use outside data (actors, directors, etc)?
Why not provide other data about the movies, like genres, directors, or actors?
We know others do. Again, Cinematch doesn’t currently use any of this data. Use it if you want.
That seems like an easy target - if I've 5-starred every movie with Kevin Spacey, I probably will like anything with Kevin Spacey. Why not mine blogs and reviews, trying to find themes which are appealing to individuals?