I'd actually give this a 3.5 if I could.
It's definitely your authentic Mexican street tacos with homemade corn tortillas. I find it hard to find decent al pastor tacos in the valley, which keeps me coming back. Price is pretty good as well for your typical meats ($2 a taco). There's a few items on the taco list that they charge for $3. Not sure if they have a taco Tuesday discount.
I've had the al pastor, pollo asado, and carne asada. All are pretty descent, but could hold back on the chicken though. I do find that they all lack flavor, and could use more salt. I find myself having to drench the tacos in their guac sauce and red mild sauce (these also lack flavor as well).
You can also ask for cooked onions and Serrano peppers, which gives a lot more flavor to the tacos.
Overall, it's nothing I crave, unless I want al pastor tacos for a good price. They have a few spots through out the valley. Also have specific trucks for seafood/mariscos.