This is one of those typical case of “you should avoid hotel restaurants” that turned out to be true. If you see this, keep walking.
Very yummy pork dumplings and Shanghai rice cakes great you at Din Tai Fung. But very long wait times and food on the oily side are a major turn off of this restaurant.
A small very busy sushi restaurant, just North-East of the tourist filled Astronomical Clock. It's definitely recommended if you're wanting something different from the local fare and isn't too far out of the way.