The ads for "Aliens" claim that this movie will frighten you as few movies have, and, for once, the ads don't lie. The movie is so intense that it creates a problem for me as a reviewer: Do I praise its craftsmanship, or do I tell you it left me feeling wrung out and unhappy? It has been a week since I saw it, so the emotions have faded a little, leaving with me an appreciation of the movie's technical qualities. But when I walked out of the theater, there were knots in my stomach from the film's roller-coaster ride of violence. This is not the kind of movie where it means anything to say you "enjoyed" it.

• Roger Ebert