Between reading the RVParkreviews site and asking questions here on OpenRoads forums, I've had excellent "luck" in finding good campgrounds. I have written some reviews for RVParkreviews, and agree that it is important to try to write about everything at the campground, good and bad.
I've gotten to the point where I virtually ignore park descriptions on a campground's own website. The pictures especially can be hilarious when you get to a campground and see what angle they needed to contort themselves into to get nice pictures.
Any review website works best when more people contribute to it!