I'm going to have to sadly report that La Taqueria is declining in quality. The prices have gone up, and I didn't love my burrito de carnitas con todo the last time I was there. It was a little dry and strangely both salty and flavorless, as if they had over salted to compensate for the lack of seasoning on the meat (or the quality). The tortilla was drier than it should have been, and I felt that the portion was too small for the ten dollars I paid. Since in the past every element of their burrito has been perfect, including the tortilla, this was a major disappointment. I haven't found a burrito that I like as much as I used to like theirs, but I have SF homies keeping an eye out. As for other things Mexican, I do have some suggestions.
For nachos and pozole, I'd recommend Zapata on 18th and Collingwood. For great mezcal and tequila I'd recommend Tacolicious/Mosto. The bartenders at the one on Valencia know what's up and will pour you something you'll love if you let them. For shrimp, La Corneta still owns it. Their garlic or chili camarones are delicious with tortillas and guacamole. El Huarache makes awesome quesadillas de cecina and huaraches. I think they're usually at the Alemany farmer's market on Saturdays, and probably at other markets around the Bay.
I'd love a Del Maguey right now to burn all the sickness away. If anyone knows where to get good mezcal in Rome do let me know.