Good thought, Marathon Man. We’re working on some explanatory text lest people take these grades too seriously.
As I noted some posts back, these are subjective grades collected (as far as I know) under non-statistically controlled conditions. They are polling students at the institutution itself, so a lot has to do with the expectations of those students. Comparison between schools is problematic for those reasons.
I think the value of these kinds of numbers (or the ratings in our Visit Reports, too) is that the extremes give you some information. A really high or low rating is suggestive that the category is something to look at more closely, particularly if that category is important.
All in all, I’d rather have as much information as possible - it’s so difficult to get good info about distant schools, and even an in-person visit is limited. One has to understand the limitations of that data, though.