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A problem I'd like to see a good solution to is selection bias. Unless there is some kind of reward, only people that really care are likely rate something

I think Netflix's move might help this. It certainly lowers the cost rating.

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There's another type of selection bias as well. I'm not going to watch a movie unless I think I'm going to like it (based on reviews, comments, description, etc.) As a result, with the exception of a few real disappointments, I'm generally at least sorta OK with most of the movies I watch.

Even most of my disappointments tend to be in the vein of "It was OK I guess but I don't see why people think this is so great."

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