Amazon calculates a product’s star ratings using a machine learned model instead of a raw data average. The machine learned model takes into account factors including: the age of a review, helpfulness votes by customers and whether the reviews are from verified purchases.
I got this in the last buy-one-get-one-free promo and so it only cost me $4.99 sight unseen. I knew that it had won a few academy Awards (which is usually a turn off for me) but I decided to add it to my basket in part to pair it with a movie that I really wanted.
It turns out that I thoroughly enjoyed it! Yes, I was quite surprised. There really is not much of a story and such as it is that is not really resolved by the end of it but that is not the point. It is a character driven movie: well written and well acted.