Although they have tried to avoid calling this a prequel, it really does give a plausible premise for the Alien movies. In some ways I think this is the movie that Ridley Scott wanted to make when he made Alien. There is much more focus on the civilization of the life forms discovered in the original movie. It is less of a bug hunt or horror movie and more of a sci fi thinkers movie. To that end it will likely disappoint the casual viewers.