By the same token, impeccable English is not even the merest indication of being able to cook. Having someone who is not the chef de cuisine botching a detail - be it a reservation, valet parking or spelling - is not necessarily a reflection on the kitchen.

To be fair, as you suggest - "may" is the key word. Often the front of the house and the kitchen are separate realms in significant ways. In some establishments at least. Competence or lack thereof in one is not necessarily indicative of a similar condition in the other. Since it is only "may", I would tend to judge the food on its own merits.

By all means, if illiteracies spoil one's appetite it becomes a part of the dining experience for that person and they would do well to avoid even those places with great food but poor language arts.

With two chefs and a career artist (read "server" ) in the family all working in fine dining establishments in San Francisco, I hear plenty about front of the house and kitchen relationships - the good and the difficult.