There is a movie rating website called filmaffinity http://www.filmaffinity.com/en/main.html that has an interesting feature called "Movie Soulmates".

It matches your movie ratings against the rest of the users, selecting the ones with a highest coincidence.

Then you can discover unseen films highly rated by people with, allegedly, your same taste.

I also found Tastekid http://www.tastekid.com/ and FilmFish https://www.film-fish.com/ quite accurate.