I almost never go to San Francisco, though I did visit the SF branch of La Mar once. There's a good new Peruvian, Puerto 27, in Pacífica, and La Costanera (which I really like) in Montara. Those are all too far away to go regularly. We have a promising new Peruvian, Mistura, on Piedmont Avenue in Oakland, but it's only early days with a limited menu.
I like Bardot in Palermo, and the very inexpensive Status in Congreso a lot. There's lots of good Peruvian in Santiago.
I agree the ethnic restaurants in BA are a disaster. Part of the problem being lack of imports and spices and Argie people trying to cook ethnic food.
But I have traveled all over South America and even in 2015, the ethnic food is a problem in South America, the continent. In fact food in BA is best in South America, after Peru.
The food in Colombia, especially Medellin, is much better than Argentina, especially in terms of ethic food, viz, Japanese and Mexican. The one thing Colombia has going for it - besides cheap electronics...
I've never been disappointed at Status, though it's not gourmet by a long shot - good Peruvian home cooking, I'd say. Bardot is more creative, though the portions are relatively small, and considerably more expensive.
I'm hard-pressed to go to SF for anything - I don't really like the city, though I go to Hardly Strictly Bluegrass in October before I return to South America.
The food in Colombia, especially Medellin, is much better than Argentina, especially in terms of ethic food, viz, Japanese and Mexican. The one thing Colombia has going for it - besides cheap electronics...