Allow recommendations to be based solely on the movies you've rated
There should be a way for Movielens to give you movie recommendations based solely on the movies you've rated. I don't trust other users to rate movies accurately. If Movielens gave you the option to receive recommendations based on your own ratings only, you'd eliminate the influence of other users potentially inaccurate ratings. If, for example, a user rates every movie 3 stars no matter what, that skews the recommendations for everyone. A strictly individualized system would eliminate that problem.
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Janus commented
But what would you base predictions on instead? Your own ratings only serve the algorithm to evaluate your preferences. But how would the algorithm know which movies match your preferences? I suppose you could base the prediction on genres or tags, but I doubt that will lead to satisfactory results...