The presence of movie stars helps: their authority is part of what keeps us fascinated by the gruesome fable, juicing it a bit, so that we can actually enjoy it.
Contagion is compelling.
Contagion is the best movie made to date about an epidemic/pandemic.
Along with the stars, Contagion has plenty of scares, though in contrast to Matt Damon and Kate Winslet, they're things you encounter every day.
Adopting a clean, chronological and punchy approach, Soderbergh holds a steady eye on panic and chaos. It's a disaster movie with a brain and conscience.