I have no expertise when it comes to Mexican or any Latin American food, but I think I can share one place with you hounds that isn't worth the 11.95 for an entree.
La Barca claims to have been there on Lombard Street since 1963, and I believe it from the cheesy decor. I'm always hopeful though, and Mr. Smith had been wanting to try it. We've heard it's quite the "scene" on Thursday nights so we went on a Sunday.
We were treated to sodden enchiladas and overly seasoned, greasy meat. My "Francisco delight" was swimming in quart of melted cheese. While not expensive, it is ultimately forgettable, and some of it's outright bad. The chips and salsa were decent but not enough to make me go back.
2036 Lombard St, San Francisco, CA 94123
Phone: (415) 921-2221
Postscript: I did a Ctrl+F search and didn't find anything under this name. If this has already been thoroughly discussed, please forgive me!