I use Yelp since its significantly harder to fake reviews on it than it is on Google. That, and the community culture is centered on high-quality reviews.
Its a tough problem to solve, no doubt, but Yelp chooses to error on the side of caution, and will sometimes flag legitimate reviews as "not recommended reviews" as a result.
https://www.yelp-support.com/article/Why-would-a-review-not-...