Every person we've had leave a negative review of any kind had done something to harm the property.
We had a woman in March not leave a review (thank God), but sent the nastiest review. Nothing would have been enough for her. She even complained that there were no dish towels. (There was one folded over the oven handle and SIX more under the sink.)
Imagine my surprise when, after they checked out, I realized they also stole all of outdoor patio furniture from the property. My guess is that she sent me the nasty message, with a notation that she wasn't going to say anything publicly, as insurance that I wouldn't report her as a thief. It's just now, many months later, that her motivation became clear. This whole time, I've thought she was just a mean thief.
Another long-term tenant dinged our property for cleanliness, saying as his basis "I couldn't find a mop" (it was in the laundry room next to the washer he used regularly). His ding came after I said I was withholding his deposit for losing his keys, requiring us to re-key the property.
Yet another dinged us for cleanliness, but failed to mention that her dog ate the couch and we had to replace it.