Taxis and Hilton
I would definitely go with the arranged ride option. Not only are their language issues, but I am convinced that many of the Shanghai taxi drivers do not actually know how to drive. You may get the ride of your life if you choose a taxi.
I have stayed at the Hilton, and would classify it as okay. The price is relatively reasonable and a good value. However, there are some really spectacular hotels in Shanghai, and some cost only a bit more. A truly good hotel in Shanghai is a service experience approaching the finest Hong Kong and Singapore hotels.