I'm a top reviewer at Amazon (top 1000 out of ~60 million reviewers) and it's shocking to me to see how corrupt most reviewing systems are. Vendors offer me free stuff and cash all the time for positive reviews. (I never take it.)
The GS reviewing system doesn't seem as corrupt to me, but there's still a fundamental flaw when the CG owners pay to join GS. Are the GS reviewers really going to come out and write objective reviews that are critical of their own clients?
I also view the critical bashers through a skeptical lens, just like tossing out the scores from the Romanian judges in figure skating. Don't just look at the scores or number of stars, but read the negative reviews to see if they had an axe to grind. Most people's writing tells you a lot about themselves, so read their reviews to see if you agree with their POV or not (same goes for Amazon). Odds are that those negative reviews are from people you wouldn't want to camp with anyway: "Their parking was horrible and they had rules against me bringing my ten kids and cousins for a family reunion in our spot."