Yelp is where people go to get recommendations and people with unrealistic expectations are given a soap box to pontificate.
I'm not saying every negative review is uncalled for, but I can't count the number of times I've heard someone say, "Fine, I'll write about this on Yelp." It's supposed to be a recommendation tool, not a weapon for revenge.
I really miss Zagat for restaurant reviews. (Thanks for nothing Google.) It seemed to attract a much more thoughtful and informed type of reviewer. For lack of better options, Yelp is still better than nothing but you get a lot of reviewers with seriously unrealistic expectations. My favorite are the reviews for things like (relatively) not-too-expensive NYC hotels that complain about things like the room being too small.
I'm not saying every negative review is uncalled for, but I can't count the number of times I've heard someone say, "Fine, I'll write about this on Yelp." It's supposed to be a recommendation tool, not a weapon for revenge.