I think that binary ratings are the purest form of rating. But you have to ask the right question. "Did you enjoy this Airbnb?" is not the right question, becau

I think that binary ratings are the purest form of rating. But you have to ask the right question. "Did you enjoy this Airbnb?" is not the right question, because you end up wanting to give a nuanced answer. But "Would you recommend this Airbnb to a friend?" is, I think, the right binary question because it forces you to distill all of your likes and dislikes into a single, unambiguous decision. The nuance comes when you aggregate many people's binary decisions. A value near 1 tells you many people felt the good way outweighed the bad; a value near 0 tells you the opposite; and a value near 0.5 tells you that people are split. I think that's far more useful than trying to ask many individuals to provide you with a granular score.