It's not just me saying SF Chinese food is kinda meh. This guy also:
The Chinese food in San Francisco's Chinatown is poor. The Chinese food in Los Angeles' Chinatown is also quite lousy. Yelp isn't necessarily the most accurate of judges, but good luck finding any Chinese restaurant in either Chinatown that can sniff an average review much north of 3 out of 5 stars.
The best Chinese food in both cities is outside the downtown areas. In the Bay Area, you can find much better Chinese food in Millbrae, Daly City, Cupertino, Santa Clara. In Los Angeles, the best Chinese food is East of Los Angeles, in places like San Gabriel, Monterey Park, Rosemead, and Alhambra.
Having lived in those two cities most recently, I grew accustomed to having to drive a half hour or more from where I lived to seek out decent Chinese food. I knew many others who did the same.
I would add San Jose to that list. And his comments on LA is right on as well.