I came from Southern California, so I have different expectations for Mexican Fast Food.
Senor Taco is likely the best I have had. The beans are haunting. Tortillas good. Shrimp burrito is excellente. Chicken burrito is great. It goes on and on.
Great salsa bar, but could be a bit hot for someone from the Midwest.
This place blows away Nando's and any other Mexican restaurant in the East valley, except Tia Rosa's.