There is no such thing as sandwich artist. Give it up, Subway! They are students who barely know how to make a sandwich.
Owners don't hire enough people during rush hour, everything is a rush, which effects quality of food/sandwiches.
The food is sometimes fresh, and I recently noticed some of their toppings are frozen (tomatoes, cucumbers to name a few), even ones they put on your sandwiches! During my last visit, they put frozen slices of cucumber in my sandwich.
Owners do not care anymore.
Mediocre food, Mediocre store, convenient location.