Just hate them as a business practice in general and their rating system is not unbiased and 100% user based. The fact that they manipulate reviews based on if you advertise or not...and worse if you decline is pretty jacked up...and basing that on first hand experience, not speculation.
I would venture to guess that 95%+ of my dining budget, while travelling, (that is not a Subway) is dictated by Yelp searches.
I generally search for a type of cooking (Mexican, BBQ, Italian, Thai, etc) and then filter the results by $$ and by Stars. One or two dollar signs, 3 or 4 stars.
You can quickly ignore the paid advertisements (just like on Twitter, Facebook, or other apps) and focus on the results you wanted. Usually, the returns will only bring you 2-3 legit results, which you can quickly read the reviews, tips, and look at the pictures to decide which one you want.
I won't generally go to a place without checking Yelp, and, I have rarely found the reviews and the ratings in Yelp to be out of line with my own experiences.
Yelp, for a traveler, is the greatest invention for being able to avoid chains and crappy food. I am sure it has driven many Mom and Pops to prosperity with good reviews, unpaid for.
I haven't really noticed that kind of stuff when I've used it, but I tend to read a few of the reviews and look at pictures of the place mostly. If it's got 5 stars but 2 reviews, I'm not likely to give it much credence. I've found some really great local places with the app that even the employees that live in the area weren't aware of or didn't think to recommend. YMMV I suppose.
Yes, this.^^^
Also, I try and always check into a place, and, if possible, snap a picture of the food and upload it in order to leave a "bread crumb trail" so I can find the place on a future visit to the town. And, to make the experience better for the next person.
I usually only review 5-10% of the places I use on Yelp, just because they used to not allow reviews on mobile devices.
Recently, in Europe, it was a severe handicap not to have a country using Yelp. TripAdvisor was not nearly as good, or as easy.