This problem of guests not giving accurate ratings, has been brought up many, many times by many hosts -- it is frustrating to very many hosts, and as I see it, it is a problem inherent in the star rating system. There is just no way to ensure that guests give fair ratings. You can do all the education and tutorials that you want, but you still cannot enforce fair use of the rating system. For this reason I think it would actually be better not to use a star rating system at all. But if we are to use it, please let's see it for what it is -- an imperfect system -- not something anyone should put too much faith or confidence in. Reviews are a far better indicator than star ratings of the real guest experience (or host experience of guest, for that matter) since in the review, one is using words to express oneself, and the reader can often assess the truthfulness of any given review, based on how it is written, and the response to it. With star ratings, no written rationale need be given for the rating, and we have seen a great many cases where guests gave hosts a fantastic, glowing review, but then rated them low (3 stars or so) in one or more categories, so there is a lack of consistency.
I would like to see the star rating system relegated to the dustbin, and the use of reviews only, as I think this would give a much clearer and more accurate picture.
And if we do have a star rating system, please, let's have it be fair, and show the hosts' star ratings of their guests on the guests' profiles. Have you noticed that the star ratings that you give your guests, do not show up anywhere on their profiles?