Being a national chain, Qdoba isn't the world's most authentic Mexican fare, but for less than $10, you can get surf and turf in the middle of uptown Charlotte in less than 10 minutes. That's pretty hard to beat.
I recommend going with the burrito bowl, telling the server "Don't be shy" with the toppings (pro tip: even if you order double meat AND get guacamole, three price only Comes to about $11) and getting the habanero salsa. It's not as spicy as out doings, and gives the mask a pleasant kick. Also sit outside, because it has an outdoor seating area. Good for people watching all the yuppies, lol.