As others here have stated, not only is this my favorite Shyamalan movie, it's my favorite movie period! It's just amazing, on so many levels. There are few movies I can watch over, and over, and over again. This is one of them. In fact, I bug my wife (who also really likes the movie) because I suggest watching it so much! Most of the time I'm just kidding, though I could easily watch it again, because it's that great.
While I've been making "movies" for many years, it wasn't until Signs that I really got fired up, and have taken a lot of my own filmmaking inspiration from Shyamalan's movies since then.
Whether it's the story, the characters, or the profound life lessons being discussed, Signs scores brilliantly on every note, and will be the gold standard for all other films in my opinion!