Regarding DSR's some people by default on anything say nothing is perfect so they will never give full marks for anything.
Therefore they do the next best thing and give 4 star rating or 80% which everywhere else is still a high rating (exam marks, hotels etc ) . . . except on greedbay where you are rated as scum.
So until greedbay can educate the those that are willing to be educated we are stuffed !!