It's fine sci-fi schlock. There's a likable cast, a few tense body horror moments, and an interesting idea with a disembodied arm. The mostly generic hodge podge of a script doesn't live up to the potential of the rest of the elements. However, the most glaring flaw is the B-plot, Earth scenes added thanks to test audiences, which doesn't have any bearing on the principal story that happens in space. Thanks, test audiences.