About the only exception I see is where there are numerous reviews for one particular campground.
Here's an example from RV Park Reviews for
Pigeon Forge Tenn....
Scroll down to King's Holly Haven RV Park and Riveredge RV Park
King's Holly Haven Ratings (1=poor 10=excellent): 9, 9, 9, 8, 9, 9, 9, 7, 5, 9, 9, 5, 9
Riveredge RV Ratings (1=poor 10=excellent): 10, 8, 10, 8, 8, 10, 10, 10, 1, 9, 7, 6, 7
With those kind of consistently high ratings I would have no problem making reservations at either one and I did. In the case of King's and Riveredge I have stayed at both and highly recommend both and if I did these Review type things I would give both a 9
BUT if the campgroung only has 1 or 2 reviews I pretty much ignore it and take my chances.
BTW- Of the Park Review type sites, I feel
RV Park Reviews to be the best.