Actually, I thought CBC was like those McDonald's places in the States - Chipotles. Big-ass burritos stuffed with different things, but certainly not Tex/Mex, although it has Tex/Mex origins. I think those big burritos are more of a California thing. And not disparaging that type of food one bit - I love Chipotles, although I haven't had one in almost two years!!!
I haven't tried CBC yet, but I went in there once. We had an expat dinner and we all entered, but the guys I were with couldn't stand the idea of eating in the place - there were no waiters! fast food! Ugh! they said. I was disappointed but one day will try it.
We went around the corner to La Fabrica del Taco (place I mentioned below) instead.
I doubt they have corn tortillas, though, at the CBC.