Signs is about an alien invasion, but there are very few aliens. Like the classic Night of the Living Dead, we get a film about people in a bad situation.
The return of the mean Mel Gibson from Road Warrior (his voice is deeper and gruffer than it has been in years), yet with the humor the man is famous for.
While the ending seems almost tacked on, the flip-flopping of who’s in control and the visible click in the mind’s of the two men keeps the action tense.