That's a bummer. I've found that TripAdvisor reviews tend to have a higher signal to noise ratio than some other sites (including Google's own reviews, where you can tell a lot of the reviews are just being cranked out so that power users can get points and "level up")
They are no angels either, or at least their daughter company. Two weeks ago TheFork featured in Dutch TV program Rambam where they proved that they boost restaurant ratings. They listed their own fake restaurant (possible, no problem) and gave their own reviews, trying to become lowest rated in the ranking. Giving rebates on couverts may boost your ranking too. Restaurant owners interviewed are not too happy as well…
Also, not specifically related to TheFork (because I don't remember...), do all ratings should always have the same weight? Are old ratings as relevant as newer?
If you want to book a romantic dinner are ratings from groups as relevant as the ones from other couples?
Is a new restaurant with two reviews at 7/10 average the same as another one with 200 reviews at 7/10 average ?
There's more to it than first apparent.
Example: http://www.evanmiller.org/how-not-to-sort-by-average-rating....