Three stars is perfect for Shinano - everything was okay to good, but nothing was really exceptional to me.
I took my mom here for her birthday and the staff was really friendly, definitely going out of their way to wish her a happy birthday. The service was really good.
We ordered a bottle of wine and soup and sushi, and everything ranged from average to good. We got the "Chad's Roll" which was my favorite part of the meal, and a few other sushi rolls as well. I would certainly eat here again, but it probably won't be my first choice.