I dunno. The ratings give a pretty good assessment of the course for that round. And on the courses I'm most familiar with, when the layouts don't change much and the weather isn't extreme, the ratings have been pretty consistent from year-to-year, within about a 1-throw range. They give a pretty good measure of the difficulty of the courses.
I think the biggest misconceptions are that individual round ratings are precise, such as seeing a big difference between 992 and 1005, and particularly that small samples, like a single round, are expected to be precise.
Which brings me to agreeing that "....particularly only a single round's worth of ratings, is flawed from the jump."