The fact is that one out ten guests there is a scammer looking for a free stay. It isn't a matter of them being unhappy with their stay- they want to stay for free, or give you a bad review that could stop all future booking. The supper hosts are their top target because you tend to pay them to keep the Supper title.
The review system only work on Hosts, not guests because they can open a new account easily. These scammers will torture you till you have a nerve breaking down and quit from Airbnb.
It is hard to fight scammers but Airbnb should at least reward Superhosts the right to remove a bad review, say per half year or every ten good reviews. But Airbnb did nothing!