Yeah, the thread is a year old, but now that it's been revived....
I stayed on a six-night HHonors award stay at the Shanghai Hilton (also called the Jing'An Hilton). It was fine -- no evidence of being "rundown" at least in the room I got or in the public areas. The location in the French Concession is very good; an interesting neighborhood in its own right, and subway line 2 is nearby. (Shanghai traffic is such that sometimes the subway is faster than a taxi!)
As an HHonors Diamond I had access to the executive lounge and the food there (both the breakfast and evening snacks) and service were very good.
FWIW, in Shanghai there is a branch of the famous Beijing restaurant Quan Ju De whose specialty is Beijing Duck; it's located on Huahai Road. Delicious!
Kathy