The feature is still there, actually! Go to a movie's page, find the Similar Movies, and click 'More'. You'll then have a gear button at the top of the similar movie list, saying something like 'want more mystery?'. Then you can pick more/less of different tags to refine the similar movies list.
The feature is still there, actually! Go to a movie's page, find the Similar Movies, and click 'More'. You'll then have a gear button at the top of the similar movie list, saying something like 'want more mystery?'. Then you can pick more/less of different tags to refine the similar movies list.