I think it has a lot to do with rain. Whenever there is a lot of rain, tourists are generally unhappy and resorts staff has to do their regular job as well as help clean up messes caused by the inordinate amounts of rain. Rainy weather also keeps the tourists closer to the indoors parts of the resorts and they have more time to see what really goes on in keeping a resort up and running. Normally, they would be at the pool or out on an excursion.
During the time of the bad trip reports, there was, in fact, a lot of rain and the reviewers even complained of that.
Enjoy your vacation! Play in the sun when you can, and utilize the rainy days for complete relaxation...read a book, take long naps, get a massage. Don't worry needlessly.