Generally it is RVPR here. Seems like RVPR has more people who take the time to post a review. A CG is going to get a negative review before it gets a positive one. The nature of people to be quick to complain.
Always take a look at the poster. How many postings have they made. The traveller who has made many postings is worth paying attention to IMO. The complainer who has only made a few & each one not happy about the CG, is not worth paying much attention to. Same with the person who gives an exceedingly low mark for a CG but only has one complaint item about it.
Everyone has their own method. Mine starts at 10 & 1 point deducted per item. Rude checkin, 1 point. WIFI does not work as advertised, 1 point. Poor value for money, 1 point & so on.