Do you think other countries haven't gone "from zero to hundred"? I'm exactly sure what you are expecting. Declaring a total travel ban, including the UK and US because they have cases? Ordering the economy to shut down? Ordering private businesses to increase stock which, in the case of food would conflict with a travel ban. Mass distribution of masks which probably don't exist?
There have been public press conferences, social media distributions and I assume all sorts of stuff on government and health websites.
I'm not necessarily defending the government, but wondering what the expectations are. There is robust reporting, tracking and medical response systems in place. Sure, it's a bit like whack-a-mole but our numbers are notably low with, I believe, no secondary infections post-identification. Does anybody realistically need someone to tell them not to travel to places like Italy, or Iran or probably anyplace else right now?