I find TripAdvisor to be as accurate as RVParkReviews or any other similar website. Do the campgrounds that have experienced deaths, child abductions and the like print those reviews? Probably not. As in any situation you must be fully aware of your surroundings and keep control over your own personal safety.
I always pull an "average" on ratings plus I look at the reasons for the negative ratings. I also do a Google search to make sure the hotel/campground hasn't been in the news for bad reasons. ALL reviews must be taken with a grain of salt-you don't know who is lying because they got called out for bad behavior or who is Miss Susie Sunshine who never says anything bad about anyone. Some people just have an axe to grind and some people won't grind on anything. Do the math, do the research and then decide if you are comfortable.