OK, here are some thoughts and reviews from my past 5 months of Bay Area dining. Apologies for the lack of photos, I never seem to remember to take pictures of my food. I live in Berkeley and don't have a car, so most of my regular places are either close to my house or to BART stations.
Mexican:
Today I had some very good lamb tacos (they also offer a pastor-ish lamb tripe taco mixed with cooked onions, which I have yet to try) and some lamb soup (a delicious broth with lots of garbanzos, scraps of lamb meat, dried ancho peppers and onion), offered by the La Barbacoa mobile operation (tagline: La Mejor de DF!) at the Laney College flea market in Oakland (every Sunday from about 4am till 2 or 3pm, as long as there's no rain). There's a salsa bar with good green salsa, fantastic, very spicy red salsa, and an onion/habanero/cucumber relish. If you really like lamb, this is almost destination-worthy, and the flea market is fun and has other Mexican/Salvadoran food trucks which I have not tried yet.
If you're in Berkeley and desiring tacos, the clear option is Tacos Sinaloa on Telegraph. Don't be put off by the location (close to UC and amid all kinds of student food glop), this is a branch of a famous East Oakland taco truck and quite authentic and delicious. I especially like the lengua and the chorizo which comes with an interesting marinade containing cinnamon. Pastor is good too. Downside: no salsa bar (tacos come pre-assembled with salsa) since it's a tiny space with stools.
Mission Burritos: I have failed to do a comprehensive taste test yet, mostly because the El Farolito location next to the 24th St BART station is sufficient to fill my needs, and is directly on the way to my favorite bookstore. I usually get the lengua tacos or lengua burrito with avocado inside. I highly recommend the latter addition to any regular burrito as they're otherwise a little dry. The meats are delicious, the taco portions are enormous, they have a salsa bar (the green/avocado is literally my favorite restaurant salsa ever, the pico is weak, the 'spicy' is a weird, almost bitter flavor which is an acquired taste but is good on beefy flavors) and all the jalapenos/carrots escabeche you can eat. You have to order chips (but they're 65 cents). This place gets crazy, especially at night (the line does move pretty fast, though), and it is NOT clean inside (and pigeons will get trapped in the restaurant occasionally before someone shoos them out. It's that kind of place). Cash only.
I also had a good carnitas burrito at the Taqueria Vallarta location next to the 16th St BART station, but be warned: They messed up my order the first time, the manager apologized for being drunk, and that location is a real mess late at night (there's a security guard outside for a reason).
I've had numerous other tacos and burritos in weird little places around SF, usually while on social excursions late at night, whose names escape me. None of them were bad.
I also had some good asada and chorizo tacos at Taqueria San Jose in San Rafael. IIRC the salsa bar was notably large there as well.
Indian:
My local standard, which is good and cheap but not a destination by any means, is Mehak on Sacramento St in Berkeley. Lamb dishes are good-to-very good and they will bring the heat. They also deliver pretty much anywhere in South or West Berkeley, and they're quite cheap ($8 entrees with rice, and there's a half-off Groupon going all the time).
I had a great dinner today at Hamro Aangan in Albany, which bills itself as Nepalese-Indian (and does have momos) but has a mostly South Indian menu. Quite a departure from standard Indian restaurant fare, and not expensive for the quality level. They make their own sauces, all of which were very complex--the dosa hot sauce had pickled chilis in it, the achar potatoes had tons of fresh cilantro mixed in. Fresh-baked naan, lamb vindaloo that was gloriously spicy. Really impressive. Chicken momos were good but not quite the best I've ever had. Finally, I've enjoyed two buffet lunches at Marhaba Halal in downtown Oakland. Restaurant is a divey dive (seat yourself, pick a mismatched plate, dig paper napkins out of a plastic bag on the counter) but it's quite good for buffet food, some dishes (the chicken and goat curries, lamb biryani, okra dishes, and especially the channa masala) are among the best renditions I've ever had, if you get there early in the lunch rush. High proportion of fellow diners are Pakistani, so it clearly wins some authenticity points. Ate there the other day before bicycling 40 miles and it did the trick.
Chinese:
Have spent exactly 30 minutes in SF Chinatown, so can't add much other than to agree that Good Mong Kok delivers a great green onion pancake and pastries for pocket change. I still have lots more to explore in Oakland Chinatown, but I liked, but not loved, Shandong Restaurant for noodle dishes. Bay Fung Tong is good for Cantonese seafood, especially with a large group (they have large lazy Susan tables which makes sharing very easy). Tianjin Dumplings (confusingly, does not serve dumplings, and is a street-side counter, not an actual restaurant) makes a good jianbing with fresh hot soymilk for a total of six bucks or so.
Other Asian: Good, not great, but certainly cheap pho and bun bo hue at Hoang Tra in Richmond. As mentioned in the last post, Larb Thai Food in El Cerrito is great and authentic, make sure you get some of the namesake and also the Lao style som tum with fermented crab. For a tamer audience, the kabocha squash curry was also excellent.
Togi's Mongolian Food was a complete surprise, found by my roommate. We were attracted by the buuz (dumplings), but ended up more sold on the khuushuur (meat pastries with a delectable juice inside--make sure you bite a corner and suck it out to avoid clothing mishaps) and the goulash. Perfect winter food, to the extent that Oakland experiences winter. One of the few places which produces a craving worthy of a an hourlong round trip on BART to get takeout and eat in my living room.
Oakland has a lot of Korean food, but I have to say that the consistent excellence of Pyeong Chang Tofu House has prevented me from exploring much further. Haven't had a bad dish (the seafood pancake, actually, is one of my favorites here), although do be aware that you get free tofu soup with every order, so there's no reason to order more of it unless you want the seafood version). Nice space and great service. Again, great cold weather food, and located in a hip area of Oakland with lots of drinking options nearby.
I enjoyed the fancy yakitori plates at Hana, but honestly don't have enough experience with the genre to make informed comment. I will say that while Ippuku in Berkeley is a well-produced experience, I didn't feel that the bill (~$275 for 4 people, versus about $80 for 2 people, with more food per person at Hana) reflected a corresponding improvement in the actual food. And Hana is a perfectly nice, hip restaurant. I ate at the Ramen Shop a couple days ago and felt that the broths, while enjoyable, weren't really interesting or complex enough to justify the price tag.
Had a delicious meal of kabobs, rice, and salad at De Afghanan in Fremont. Lots more in that vein there to explore, but I was taken there by a client of Afghan origins who lives there, so his opinion is definitely worth taking into account.
Random other stuff: Miss Ollie's is quite good upscale Caribbean food with clear attention to detail, but the price tag was way higher than expected (The Bay Area has a very wide disparity in what people consider 'expensive' and reviews on Yelp and elsewhere reflect this). Telegraph Beer Garden has one of the better burgers in the area for $16 (the standard for burgers here is very low compared to the Midwest) and is a nice place to sit in the sun and drink IPAs. Berkeley Bowl really is a wonderful grocery store.
Still trying to explore more regional Chinese places in outer-borough SF and the South Bay, ditto more Indian places in the latter. Reviews for Sichuan places are all over the map, so I don't quite know what to think. Still trying to drag friends to the Laotian spots in East Oakland and San Leandro.