Virus couldn't have worked
I know this is nit-picking (and IMO, hardly the film's biggest problem) but the virus depicted in the film wouldn't be able to spark a worldwide pandemic because of its extremely high virulence.
It would kill its hosts faster than they could pass it on and ultimately cause only lethal but small-scale and short-lived local epidemics.
Nobody is entitled to an opinion. Everyone is entitled to an informed opinion.