I guess I've been part of the problem. I have given good reviews when things have gone wrong but they have all been minor like a single cockroach found at a tropical property (where its impossible to keep them out regardless of cleanliness). One problem is a 5 star review is subjective. A super cheap place may deserve a 5 star based on what one would expect at that price point. You also have to remember 5 stars is not equivalent to the hotel rankings.
It goes the other way as well. Sometimes the really bad reviews are out of the blue and unwarranted. For instance at this one I stay at has had some bad reviews but its mainly people who did not read the house rules or even the actual description. Another one they were expecting a 5* resort on a $100 a night Miami beach rental where nearby hotels are charging 4x that price
I'm at 16 stays so far (8 in the last 8 months) Outside of 2 minor issues and 1 host who cancelled last minute, my experience has been positive.