Keep your friends close and your enemies closer. There have been numerous cases over the past few years where reviewable sites have been rated supremely low by Hoteliers. Likes of Yelp or TripAdvisor for example, attract continuous pettiness of complaints, which never fail to astonish.
The freedom to choose the level of pickiness that the customers often adopt to review their stay goes beyond belief. Unfortunately, even if exaggerated they can lower the star rating of a hotel before it even has a chance to compensate for any inconveniences that it had imposed on the guest.