Great fresh Mexican food - NOT mission style
I've been eating at Pancho's on Polk since I moved to the city in '96 from Arizona -- 10 years of consistently great food which I highly recommend.
Food highlights: VERY consistent high quality food. They have 4 types of salsa, two of which are really outstanding - the fresh pico de gallo and the green salsa (tomatillo perhaps). When you order tacos or quesadillas, they hand-make the thick corn tortillas (gorditas) right on the spot. I recommend the chicken fajita burrito (without beans) or some fish tacos, and a mug of Dos Equis (sometimes on special for $1.50/mug).
Service: Never a problem - they are quiet and polite, and since the food is made fresh (not from a steam table), the 3 extra minutes required is fine with me. I always tweak my order somewhat (no beans or rice in a burrito, for example) and they have yet to error (this is in *10 years* people). The same staff are STILL working there since '96...this I'm sure helps the consistency.
TIP: This place doesn't not make the enormous, bean & rice filled, foil wrapped, steam table burritos that are served in the Mission (which I personally avoid anyway). Nor do they do the saucy/cheesy Sonoran-style food of southern AZ (ala Tommy's).