Yes, but try China Town only if you don't mind being elbowed by all the tourists. This is a U.K. site, but I live in the U.S. and travel to SFO regularly.
If you insist on attempting China Town be sure to try Great Eastern Restaurant at 649 Jackson (at Beckett). they are well known for the quality of the seafood. I tend to judge a good Chinese restaurant by the quality of their Hot and Sour soup, since it's a complex dish and takes time and effort to produce. Great Eastern's is one of the best.
Outside of China Town, be sure to try Hunan # 2 located in the Richmond District at 4450 Cabrillo Street... great hot and sour but don't miss their Ginger Chicken...
Enjoy!