* At this point in the epidemic you can't compute fatality rates simply by deaths/recoveries, because recoveries lag deaths by several weeks (once you're dead you're dead, but if you survive it takes a few weeks to recover and start testing negative).
* It is well known that China is undercounting cases, not because of some deep CCP conspiracy, but because Wuhan/Hubei's health system is so overloaded that only the sickest cases are hospitalized, much less tested.
* This also skews death rates very high, because mild cases are not detected and counted at all. This is also clear from the divergence in death rates in Hubei (2.x%) and outside Hubei (under 0.5%, and there's undercounting happening here too).
* The virus has been in the wild in a number of countries outside China (Singapore, Japan, Thailand, etc), yet to date local transmission has petered out and there's no sign of massive outbreaks happening. This argues for a much lower R0, and/or that there's something specific to Wuhan that favors the virus, with cold, dry winter air and heavy air pollution (and the accompanying chronic lung damage) cited as possible factors.