I really liked M. Night Shyamalon's Unbreakable, and really, really liked Sixth Sense, so I wanted to see Signs right away. What a disappointment.
Spoilers ahead
Come on! Aliens that can travel untold light years through space, and can make their spaceships invisible(!) need physical directions carved in crops for navigation? They couldn't just float some signs in the sky, use geosynchronous satellites, or I don't know--steer by the stars; something lowly humans have been doing for eons?
And these aliens, again who can travel across the hazards of space, don't think to wear some form of protective suit, so that water--which covers 70% of this world's surface and falls frequently from the sky--doesn't kill them? If earthlings went to a planet with a breathable atmosphere but also sported showers of, say, hydrochloric acid, you think they wouldn't wear protective gear? If this is the smartest the galaxy has to offer, then they're in trouble once we reach other stars.
It seems that the studio wanted to reward Shyamalon for his earlier success, but wanted him to get something rolled out before the buzz quieted down... and he took a story he wrote in third grade and made it into a movie.
I will give him some credit for the characters he developed; there were some cute and touching moments in the film, but otherwise it was silly.
Hmmm