Taqueria del Sol is another TV-famous spot in Atlanta. They have several locations, including one near Georgia Tech, but I've only been to the Decatur location so far. They do huge volume but everything moves very quickly. Speed is good for tacos, which are best fresh. Making tacos in volume allows them to keep all the components of the taco fresh and tasty.
I had two tacos today. The Memphis had BBQ and cole slaw. The meat was spicy but not overly spicy. The carnita was more classic. In both cases, the tortillas were fresh and wonderful. I also had a small bowl of chili verde, which really was the favorite part of the meal. Green chile isn't that easy to find in this part of the country. This cup made excellent use of the chiles as well as the meat.