I really didn't like the opening credits of this movie. They were kinda dull and had no stylistic relevance to the story. There's nothing I hate more than starting a train of thought and then dropping it for no apparent reason.
Signs is the type of film that Hollywood rarely makes anymore. It takes a simple approach to a complex issue, relying on pacing and acting rather than explosions and bootie. Not that there's anything wrong with either explosions or bootie, its just a nice change of pace.
Without ruining the ending of the film, don't go into the theater expecting The Sixth Sense. I was afraid that M. Knight Whatshisface was going to go all "queer" on us (industry term) and pull out some ridiculous ending. Instead, he relies on the subtleties of the films message to resolve the story. It may not be the ending that you want, but it's nice to know that he isn't just "yankin' your crank" (non-industry term). On a scale of 1 to Club11, Signs gets an 8.