Condado Tacos is a chain and Pittsburgh has too many good local restaurants to waste time there. The only good thing about it is it is close to the convention center.
Walk up Smallman street and there are dozens of local places available. If you don't make finals walk over there on Saturday morning for the farmers markets.
The best sandwich shop in the world is Peppi's on the north shore. It's a hike, but you need the exercise if you are going to eat there anyway.