Yelp is totally useless. They "filter" any bad reviews and don't include them in their ratings. I had a particularly bad experience with a restaurant, wrote about it on Yelp, then went back to my review a couple of months later to find it hidden in the "filtered" reviews. Several other reviews with the same complaints were also hidden. Basically, Yelp hides all the bad reviews, assumably to garner ad money.