There is a small Mexican restaurant in San Diego that I've been eating at for 25+ years. It's been owned and run by the same family all those years. It is consistently one of the best (top 2 or 3) Mexican restaurants I've found in the US. Many years ago when they first started requiring the 'grade' to be posted, it varied between a C and D. For years and years it was a C. The food and service has always been excellent. Neither myself or anyone I know has ever gotten sick.

How many would avoid this restaurant?

Of note: When dining there a few weeks ago after a 18 month hiatus, I noted the grade was an A.