Highly recommend MovieLens if you have eclectic or niche movie tastes. It can be a bit of a nerd-snipe though. One of my favorites activities is rating movies and watching the recommended ratings (what rating it thinks I'll give a movie) update overnight.
It's at the very least, better than average chance at predicting which movies you will like.
It's at the very least, better than average chance at predicting which movies you will like.