Agree on that while homemade food on the Mainland can be out of this World, restaurant cooks do not care about their customers experience if it's not a family business or you happen to know the owner well.

But would you not think of Japanese and Korean joints being the stars of the non-Chinese restaurant scene? Shanghai is one of the few cities in China where the cold chain works so I'd really recommend to try either Japanese or Korean sashimi and sushi there.