We have poor to mediocre sushi restaurants here in Raleigh, NC if you judge them by the quality of their fish. Now, I'm not saying I'm a sushi connoisseur, but I've been to high end sushi restaurants in major cities (Atlanta, NYC, LA, Miami) and I know what we're getting here isn't even close to premium. But people review some of our restaurants and say "this is the best sushi I've ever had."
But you know, you go to these restaurants and see what most people order and they are rolls with insane amounts of sweet sauce on them and sure, they are pretty to look at, but if you're looking for say, an edible piece of Uni here, you aren't going to find it.
This is a country where people think Olive Garden is good Italian after all.
So anyway, I ignore the star reviews and try to find a review where someone took a few minutes to describe what they liked and disliked. One or two reviews like that are way more valuable than the ratings and it's usually pretty easy to spot the fakes.
Specific example. This place has mediocre sushi, a menu that hasn't changed in years, and their service is often slow:
https://www.yelp.com/biz/yuri-japanese-restaurant-cary
But they treat us like family. I'd never have found that out from Yelp reviews. No, on Yelp you find people complaining that they don't offer BOGO or the parking lot. Other people say it's the best sushi they've ever had. You won't find a review that says "typical neighborhood Japanese restaurant where they treat regulars like family. The service can sometimes be slow and it's not premium fish, but there's a variety of competently made sushi, and decent selection of non-sushi Japanese and Korean menu items. After a few times here, they'll probably start comp'ing you dessert."
Here's a Yelp review from another Japanese restaurant in the area:
> I used Uber Eats to get delivery and it was delicious. Sushi is generally really good or really bad. Not much in between. The disposable chopsticks were the cheapest I've ever seen. Those could definitely be improved.
That's a 5-star review. I mean, come on.
See also: rotten tomato audience scores.