Pancho Villa takes the award for best all-around taqueria in San Mateo. I know there are some strong contenters. I'll focus on burritos - my favorite.
Here is why PV stands out. Fast, fresh, never get the order wrong, variety of tortilla shell (spinach, tomato, flour) variety of salsa (fire roasted, hot, mild).
The most spotless open kitchen of any taqueria in the Bay Area.