I don't think that calling the numbers unreliable implies incompetence or even worse, malice, on the part of the reporting country. It's simply difficult as shit to come up with reliable stats on something very new in the middle of an outbreak. Think of how many people aren't even noticing that they have the virus, and thus will never be counted as infected. This is just as true in Milan or California as it is in Wuhan. All numbers are noisy and subject to substantial revision. It is, however, quite clear that this virus is not as serious as SARS or especially MERS. It can still kill millions if it infects hundreds of millions though, so that's just a comment on whether you, individually, should worry about getting it.