I fly through Charlotte airport almost weekly and stop by Quizno's at least one time during the week. I always get the Veggie Guacamole Sandwich, chips and water. The sandwich is always good and very filling. There is always a little bit of a wait but there is at most of the restaurants in the airport.
The only negative and the reason for the 4 instead of 5 star is the customer service. It is not overwhelmingly pleasant but they are not rude either.
I'll continue my weekly sub from this location.