Occasionally "force" me to rate movies I've already rated.
I end up rating movies that I've recently seen much higher than similarly good movies from years ago. Giving me (users) an occasional movie to rate that I've already rated without my showing my previous rating might keep algorithms freshly accurate, or at least would provide additional data points. Complex? Yes, but perhaps quite valuable.

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Anonymous User commented
can't you just go to the "movies I've rated" list yourself and then re-rate whatever you like? I don't see the benefit of being blind to you former rating.
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Anonymous commented
I have only been a user of this website for less than a year and I can already see that I will eventually need to re-rate many movies to keep the recommendations accurate. Anything that would help with this would be awesome!!!
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Theo Nilsson commented
I’m thinking this could double as a feature to showcase movies I liked but haven’t seen in a long time, or unexpected dislikes I might be likely to reconsider.
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Carlos R. commented
This is an interesting idea and I see how it could be useful but is something a user should consent to. Perhaps a "re-rate movies" or some other more appropriate/telling title or explanation as long as it is clearly stated or opt-in or both.
I can see a large demographic of users mistakenly thinking that something is glitching in the system rather than that ML is trying to improve its algorithm.
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Marika commented
Interesting idea, I see your point. I really like this! For me, as I rate more and more movies, my "scaling" ends up changing quite a bit. For instance. I might give movie X a 5 star rating at first. But as I rate (and watch) more movies, I might realize that Movies Y and Z are actually just a bit better than movie X, to which I should maybe have given a 4.5 or a 4 instead.
However I don't think I'd like these titles mixed in with all the rest all the time. Perhaps it could be an optional setting that I could turn on or off as I feel.
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Marc commented
I thought this was interesting, so I went through all my rated movies and re-evaluated my ratings. When I was done, most of the top picks were different, and much more accurate. This is a solid idea.
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Emma commented
I like this idea too. Maybe if you keep the "rate random movies" section it can throw a few already rated movies in there.
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Thanks for your feedback - this would be a fun feature.