I used to have a friend who always said "the worst beer I ever had was wonderful". Too bad this is not true of BBQ. Your story reminds us that there is some truly awful BBQ out there, in little hole-in-the-wall joints, as well as in big, bright national chains.
It also reminds us that a lot of people have not had the pleasure of knowing what true, good que is and so do not have a good basis of comparision.
This serves to keep us in the hunt for the next "holy grail" of a bbq place, and to keep spreading the word about real BBQ.