For the first 10 minutes you want to leave the theater, because it seems that you're watching some unbelievable teenage gibberish.
The next 20-30 minutes you resent in your heart: what is going on here? What is this nonsense, how can this even be?! At the same time you occasionally shudder from fright. But you don't want to leave, no.
And then the plot drags on so that the farther into the forest, the clearer you see - we are not a typical American horror, made on a quick hand on the knee. There are no twisted Japanese girls with blue faces, no monotypical 'haunted houses' and couples slaughtered by a maniac at the most interesting moment. There are no clichéd moves. There are only two frightened children trying to understand what the hell is going on around them. By the end of the movie you already feel like the third child, drawn into the events happening on the screen, and you are waiting, impatiently waiting for how it all ends, how the creators of the movie will explain what is happening on the screen.
The frightening realism of what is happening. An interesting story, which is not as simple as it seems. Great acting that evokes real emotion. No contrivances, no special effects, just an original movie, atypical in its genre and that's why it deserves attention and interest of a wide audience.
Shyamalan did well and made a really interesting and unusual movie.