There are very few foods that are good in all circumstances. The fact that Mayo and Mustard have certain applications that need them, indicate there greatness. Is Lebron overrated as a basketball player just because he is useless during heart surgery?
I merely agreed that it was overrated in the circumstances in which some people put mayo on everything. I never said it wasn't good.
I can't stand mustard, especially honey mustard. Maybe it's because I didn't grow up eating it but I just find it absolutely horrible. I've given food away because it had mustard on it. If I ever taste it, it's all I can taste for the rest of the day.