I've searched high and low for good tacos in Pittsburgh and my favorite one so far is all the way out in Canonsburg. They do taco Tuesdays where you can get 3 tacos for a very good lunch price. My go-to tacos at Los Chiludos are fish, carnitas, and chorizo. Their standard taco comes with a heaping serving of onions and cilantro, double wrapped with tortillas. Their green sauce is delicious and I typically add enough jalapenos on top to turn up the spice. The reasons why Los Chiludos crush all the taco places in Pittsburgh are simple: GOOD price and they simply make good tacos! No hipster weird tacos here.
The only wish list I have for Chiludos is please get lengua or tripa. I am still on the search for those tacos in the area.