I'll call BS on this one. True your other quote about having some shitbags from UND may be true, but like all aviation places, they put out good pilots, average pilots, and crap pilots. Because UND has such a large aviation program, well over a 1000 flight students, there are going to be quite a few shitty pilots. Because they are paying customers, no need to wash them out I guess. Anyways UND only keeps the good pilots as instructors, the crap ones go other places to instruct. Gives UND a bad image though, I had a friend who was a horrible pilot go down to FIT in FL, because he couldn't get an instructing job anywhere else, I'm sure he gave UND a bad name. And of the 10 or so UND grads that I know personally that have gone into the Navy all have scored high 60s to 80s.
But personally I think as well as you do in Primary, its all about how lucky you are with who you fly with (easy graders vs mif monsters), and when you select.