Sounds like some of the viral marketing actually should've been in the film.
The death scenes can feel unaffecting, and they aren't helped much in their significance by the fact that much of the crew are married. It's an unexpected element, and Scott attempts to use it to make each death all the more painful to witness. However, the impact isn't always there. Holding things back is the script in general, as we don't learn enough about what the crew members are leaving behind or much of anything that would help the audience try to understand their relationships on a deeper level.
