About sushi restaurants:

I guess some people like Miyake. As a recent magazine ad says: "But then, some people like nipple clamps." I won't say anything about the Miyake atmosphere, the prices, the disco ball, the service, nor the clientele. But I will say that I don't know of anyone who has gone there and not said "I don't understand how anyone could eat that stuff."

About Midori: yup, all the "Japanese" restaurants in that area are Korean. I personally like the Korean style of sushi, so it's no problem for me, and I find Korean sushi restaurants less stuffy than their Japanese equivalents. At Midori and others, they work very hard trying to convince you that they're Japanese, not Korean. At some of the more mom-and-pop places, that are less closeted about their Korean-ness, you can get some Korean side dishes with your sushi. Yum. For Japanese-owned places (if that matters to you), Yakko in Mountain View is pretty good, though the service is often, er, brusque.