My experience is that some CGs change ownership every few years, so a review a couple years old may not be valid. I look more into what they are complaining about. For instance, many campers rate CGs low if the bathrooms are not modern and clean. For me, I use my TT bathroom and really don't care about their bathrooms, UNLESS they are an indication that the rest of the CG is broken down and not maintained. Also, people complain that there wasn't much to do for the kids, which is not applicable to me any more. Also, if the pool isn't nice and clean, I don't care when I camp off season and it's closed anyway.
It seems there are a plethora of comments about owners or staff being rude. I generally find that staff are as pleasant to you as you are to them. As long as they aren't berating me or taking hours to check me in, I really ignore the rudeness comments.
The comments I concentrate on are:
Site size and levelness
Access and circulation roads (condition, width, tight curves, etc)
Price
Availability and dependability of utilities
Flooding problems