I have eaten at ginkgo about a dozen times but only during happy hour. I like the fact that it is tucked away and underground. The staff is always efficient and friendly. The manager always makes sure to say hello. The environment is fun and modern but small so come early or make reservations.
I always order miso and edamame - both are simple and delightful! I will typically order a roll from the main menu and maybe a couple things from the happy hour depending what they have. The hamachi roll we ordered last time was "off menu" and super good! Maybe it was called Hamachi Oshi? I would have to say that overall everything is consistantly fresh and tasty.
I would like to see a small "chef's special" board with maybe a couple creative rolls that change daily. A sushi joint I used to frequent out of town always did this and was typically a big hit.
Ginkgo is a bit expensive but so is everything in Tremont. Parking is tight in this area but there is neighborhood parking all around within a couple of blocks if you don't mind walking, which I don't. There are a lot of cool shops and restaurants in the area that are definitely worth checking out!