We’ve had a Netflix subscription for a few months, courtesy of a smart friend who gave it to us for a new-baby present. I just now got around to going through the "Get Recommendations" process, which starts by offering you a selection of movies to rate; when you’re done, supposedly, it analyzes your taste and offers you a wide variety of movies that their computer thinks you’ll like.
So I did that (making a few adjustments such as "I love children’s movies," given that most of what we get is for the kids), and then it listed for me 14 "best bets" and 14 "movies you’ll like more than most people do."
So much for a wide variety. Every one of them is a compilation disc of episodes of Doctor Who.
Not too useful, except perhaps as an "Interesting Fact About Myself" to use in icebreaker games.