Is Yelp Fair to Restaurants?
Yelp takes an even-handed approach to the process and considers which reviews are bogus and malicious. Yelpers are, for the most part, fair to restaurants. Most people write a balanced review, realizing their tastes may not represent everyone else's. As in life, there are a group of people who have a critical spirit. They will not be pleased. You can usually look at their review history and figure that out, though.
No, Yelp is not fair. And their business model is thinly veiled extortion.
Yelp is a consumer-rated site, not unlike Trip Advisor. If you are consistent with your product, then you will have consistent reviews. The rest is up to you.
Most comments on Yelp are genuine. There is some manipulation with how they filter some comments. Restaurant reviews are so personal, just like the tasting palate or feelings.