I first experienced authentic Japanese food in the late 70's as a native San Franciscan. Ba Sho meets authenticity on all counts - the simple, restrained decor, the Japanese ladies serving the tables, the precision and creativity of a traditionally trained sushi chef, and a lengthy menu with some non-Americanized selections. Coincidentally during our Saturday evening visit, about half the patrons were Asian (mostly Japanese) - a really good sign in an ethnic restaurant. With the trendiness of sushi since the 90's, I have run across a lot of pretenders. Ba Sho is totally genuine.
Atmosphere: nondescript strip mall location; basic, no frills Japanese decor; also two tatami rooms (requires reservation)
Food: the menu selection I saw online looked promising for authenticity and has many a broad variety of selections (additional a la carte menu of unique Japanese selections is available); all of our raw fish selections whether sushi or sashimi were full of the texture and subtle flavor of fresh fish; i ordered the Basho Dinner Box Deluxe to sample several items (Unagi, potatoes, pickled veggies, sashimi, omelet); the only item that was merely good rather than excellent was the tempura due to the tempura batter similar to what I make at home out of the box; chirashi was excellent with the more trendy large bowl presentation rather than the traditional lacquer box
Service: efficient in that Japanese way; tea cups were kept full and warm (a mark of traditional Japanese and Chinese hospitality)
BTW, the menu's statement of "NO SUBSTITUTIONS PLEASE!!" is also very traditional Japanese (but not Chinese)