What can ruin any movie?
Poorly developed motivation and intelligence of the characters; for example, it is illogical when an astrobiologist removes protective equipment on a foreign planet. A real astrobiologist would not do what it is absolutely impossible to do. And in the movie did, and now the whole team is infected. But it was just a lazy way for the scriptwriter to get from point "a" to point "b".
Weak communication between the characters; when the connection or resolution of a conflict depends on the fact that the characters illegally decide to hide information from each other because "there is no time" or "I will explain when we get there." Again the scriptor.
The older I get, the more I get angry when I notice the scriptor’s lazy manifestations in the film’s story.