There is no good or authentic Mexican food in Pittsburgh that I have found so far, but this is terrible. There are several other "authentic" Mexican restaurants in Pittsburgh that are at least edible.
Having lived in California and eaten at many Mexican restaurants throughout the West where they have extremely large populations of Mexicans, nothing here is even close. My wife won't even let us go to a Mexican restaurant here because they are all bad.
Objectively though, the food was poorly prepared, flavorless, and they put what tasted like packaged brown gravy mix all over my food, yuck!!! If you are going to eat Mexican in Pittsburgh, the very best by far is Iguana Grill on the South Side.