I believe that the current star rating system is unfair for three reasons: 1) A host is better off if a guest doesn't give a rating at all, rather than a less than 5 star rating, and 2) I've found that long term guests rate our place more highly than guests that stay for only 2 days. One would think that a rating for a long-term guest should have a higher weighting than that for a short term guest. 3) A host could achieve 5 stars in every category but a 4 star overall, which for some unknown reason results in a less than 5 star rating. I currently have a 4.8 star rating but missed superhost status, which is very frustrating.