Los Taquitos is a counter service Mexican restaurant in the Phoenix airport that should be avoided at all costs. I can confidently say that Los Taquitos has been my worst experience eating out in the 365 days, which has a sample size greater than 300.
The one redeeming quality is that the folks working behind the counter were really pleasant.
The food tasted awful. If you get tricked into paying for food, do not eat it. The guacamole had slimy brown spots, the rice was dry, and the bean tacos/burritos or whatever were nothing more than refried beans loaded into tortillas. I tossed the meal after a few bites.
The food took a long time to come out. I almost thought they were making it all from scratch. Nope. If you have that much time, try eating elsewhere; the airport has many options. Heck, there's better restaurants right there in terminal C.
Los Taquitos is not worth it. Save yourself the time and money.