My favorite horchata and carnitas tacos and burritos anywhere. The salsa roja is also the best. Pretty spicy, so go for the green if you can't handle it. The horchata is sweet but not too sweet, and has that gritty cinnamon that makes it perfect.
But two problems at this, and all, King Taco locations. One--they're stingy with the salsa, and two--they take forever. If there's more than a couple people in line when I arrive, I just leave cuz I don't want to wait half an hour for my food.
Also, I have no idea how the people claiming the nachos are good here are serious. I've never heard of anyone liking them. The tortilla chips they use are crappy ones they clearly buy from somewhere and the "cheese" is some oil-based garbage from a machine. More power to you if you enjoy that kind of thing, but it's not what I expect from real Mexican restaurants.