Yeah, I'd agree that the ratings are silly from a "science" point of view. But, they certainly serve as fodder for discussion and debate. Seems natural for people to want to rate things, and then go to the mat (or war) to defend that their beliefs, expressed in their ratings, are "right".
From a science or mathematical or a statistical point of view, I guess you could say that, if the rater group was demographically representative of all golfers, then the results of the ratings might be numerically accurate within 5%, 19 times out of 20, in representing what the view of the population is. Lots of social sciences do statistics that way. However, in course rating I suspect that the rater group is not representative of the whole, and in the end the rating of any criteria is more of a gut reaction than it is a measure of some quantifiable attribute. How can you quantify aesthetics or ambience, for instance. It's in the eye of the beholder despite any set of criteria.
And to make it worse it seems likely that many raters are rating based on one or a few plays. Like looking at women (for us men, or men for the women out there) the first look is often colored by infatuation. True love developing over time. But, when were infatuation or true love ever scientific?