Some restaurant review math. A restaurant is open 300 days a year. For dinner they average 150 covers. That is 45,000 meals served in a year. A reviewer and three guests dine at the place for the traditional two visits. That is 8 meals out of 45,000 or a .017% sample. That may be enough to give a restaurant a good review, but no where near enough to pan a restaurant with the resultant potential devastation a bad review brings to a restaurant and its staff.