I have jellyfin with the radarr/sonarr/prowlarr combo going. I can “heart” things in jellyfin. But it’s recommendations are only things I already have downloaded. I see discovery in radarr, but no way to tell it if the movies I downloaded were good or bad. So I must be missing something.
I don’t use them for recommendations; that’s not what they’re for. To discover new movies, I use podcasts, letterboxd, IRL recommendations from humans, and sometimes awards and film festivals.
I do not use algorithm-generated recommendations for movies; they are more difficult to optimize vs music recs, and when they’re wrong it’s a waste of my 90+ minutes instead of the 3-4 min a bad song takes. I want a little more manual oversight into something I am going to spend hours on.