@Wesley58 et al
Airbnb's terms and condition and customer support are the constraining factors in all this mess, its human nature that a guest that gets marked down will do likewise.
Where the problem arise is the effect the star ratings have on your listing and the penalties that Airbnb adopt in such cases, putting you down the list on potential properties to rent, losing super host status etc
How would you feel if the star-rating system was just that, no penalties, it would change the game dramatically, do you know what? it would even make the system more accurate in my opinion.
What we have now is a bureaucratic mess not fit for purpose and to an intelligent person complete nonsense.
If one’s listing is a complete dump the review will say that as human nature being what it is, people are more likely to complain about bad service then good and those people that are motivated to write good and fare reviews will give one’s listing enhanced value to a potential customer.
I have made the case before that all hosts should start at five stars and let the review process decide where they sit on the measurement scale. While I had super host status, I had a 4.9 average but there’s no way my apartment was a five-star offering in the conventional sense, BUT it was priced accordingly.
The well-known feature of star ratings, is the price charged so for example while traveling on business one stays in a five-star hotel, not so much going on family holidays unless of course you’ve got very deep pockets.
So, the consequences of Airbnb’s nonsensical star review set up is guest are expecting one experience at the price of another.
In conclusion,
Remove the penalties and let the system become self-regulating, what I would expect to see is considerably more granulation and a matching of guests to what there prepared to pay for, and those listings that get consistently bad review fall out of the system.