I have posted over 200 reviews on RVParkReviews.com. I have never had a review rejected, and some were well south of favorable.
Remember, that site is not the Complaint Department for RVers. If you try to post a rant, or even a lengthy complaint about a single issue, they will send it back to you. I make sure my reviews provide information that other RVers care about: interior road conditions, site size and construction, whether sites are level, the quality of the power (especially under load in hot weather), the quality of the water, privacy, aesthetics, bathroom/shower cleanliness and appearance (even though we don't use them), helpfulness of staff, etc. If campground staff are rude or unhelpful, I sure include that in my review.
We haven't camped anywhere without checking that site first in years, although we have been the first to review a number of campgrounds.