The kids (spoilers)
I liked the film as a whole. One of the things that let it down though was the make up they used on the dead kids. It just looked like bad Halloween make up. Same could be said of Boogie, who looks like a Kiss reject. If this had been slightly more subtle, or done slightly differently, same plot etc, for me personally it would have taken me that much further into the film. I didn't even mind the shushing thing that much at the end of the home movies, but it wasn't needed in the other scenes. The ghost kids should have also appeared much later as it gave the twist away a little too early. All in all a good film - atmospheric and tense. Soundtrack was terrific. Ethan Hawke plays tortured pretty well, and the lawnmower scene will go down in history.
It's too cerebral! We're trying to make a movie here, not a film!