The Worst M. Night Shyamalan Movie?

I haven't seen enough of them to give anything approaching an erudite answer, but I understand The Last Airbender is supposed to be awful, although I haven't seen it.

Of the ones I have seen I liked The Sixth Sense best, but I thought Signs wasn't that good, although that might have more to do with Mel Gibdon.

All of them, except for the first one. And it was pretty, and pretty average as a thriller. They went sharply downhill from there. I think he might have been a much better set designer or cinematographer.

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Knock at the Cabin started with potential but was flawed, what with it's reference to biblical prophecy, i.e. The Book of Revelation, and unnecessary graphic gore. David Bautista and Kristen Cui were outstanding in their roles.