I sometimes rag on China and the initial response of the local CP of trying to cover it up was pretty bad. But I have to give them some credit. By publishing the genome in early Jan. they gave the World a head start. And, as extreme as it was, their social distancing probably saved a lot of lives. And the relatively slow increase of new cases, given the extent of the initial spread is a strong indicator they have brought R0 well below 1. In the meantime here in the USA we seem to be caught with our pants down. It's appalling that the initial test kits had limited availability, were flawed, and that, until just a few days ago, people weren't even tested no matter how severe the clinical condition was if they didn't have a known contact with another infected person or other indication of exposure.
Also, Chinese scientists have been the major contributors of raw data on Github to share information databases and program models worldwide.