I've visited this Don Tortaco several times for midnight food runs (they're 24/7). It's your average fast-food Mexican restaurant with everything you would expect: tacos, burritos, carne asada fries, etc.
In the handful of times that I've gone, I've never had any problems. They can be a bit slow at midnight, but I imagine they only have a couple people working, so it's understandable...especially if the line is multiple cars long.
Overall, if you're craving good, fast Mexican food, Faustos is vastly superior...but they close at 11PM. Well done, Don Tortaco.