This is so true. My spouse and I are retired enlisted AF, and it worked the same way with us. If you didn't get almost all perfect scores of 9 (and then later, under the new system, perfect scores of 5), you were a goner.
You could survive one or two 8's if you were very young, but if you got more than a couple 8's, a single score of 7 or below, or the kiss of certain death, THE OVERALL 8, then you better pack your bags.
But to the uninitiated, those reports might look quite decent. Sevens and eights on paper looked good. I'll dig out one from the late 70's and see what the catagories were rated.