Emotion is a huge part of the artistic process. It doesn't matter if it is film, art, writing scripts/novels. Without it what would be the point? If I feel nothing when I watch a movie, look at a picture, or read the book, why would I waste the time? The technical aspect of filmmaking is important, but far less so than the culmination of techniques used to move/manipulate an audience to buy into what its preaching.
Aliens is full of technical mistakes. Its arguably the second best film in the franchise because of everything else it did well.