If you're only buying the tacos at taco loco, I'd give it 5 stars easy. It's also in a very odd location out past the mall, so you have to have it in mind and make the trek out there. It's worth it, though. They have outstanding tacos. They are very simple with no gimmicks---great tortillas, some tomato and onion, some cilantro and your choice of meat. My particular favorite is the chorizo--very good.
I have to give the place 4 stars, however, because I don't think the rest of their fare matches up their tacos. So stick with the tacos here, get three, and have a great lunch or dinner.