So the DJ tells us that 69% of NYC restos scored an A on their health inspections. Hooray! The Cod recalls that restaurateurs were tripping about a letter grade system, on the grounds that customers would be spooked by the non-A grades that many places would get. As it turns out, the problem turned out to be basically the opposite of that. The Cod has chewed on the vagaries of different grading systems before, but it's interesting that the DOH is giving A's out like many humanties profs do.
Some background: long ago, an A was a grade that indicated outstanding work, work in the top 10% of the class or therabouts. At some point, the goalposts moved, and in many contexts an A became the grade you got for showing up, doing the work, and not making too many mistakes. In my day job, I'm about as guilty as anyone, but I do try to explain that not screwing up does not automatically mean you get the best grade there is.
By definition, 69% of restos cannot have outstanding sanitation. But, in spite of itself, the system might be working out, if A means "satisfactory," B means "needs work," and C means "you will probably shit your guts out." The only danger is if NYC diners presume that A means "really clean." If they've looked at Junior's report cards from Bennington, maybe they'll figure it out.