Shyamalan can write, but he should let someone else direct.
I think it's the opposite, myself. Shyamalan can craft genuinely suspenseful scenes and create an air of menace quite well, it's just that his scripts start to fall apart after the first act, and he's way too dependent on inserting some faux-profound message into his stories or throwing all logic out the window in order to support the build-up to a big twist ending.
Even in one of his worst films, The Happening, the first act where people are committing suicide en masse and no one knows why is unsettling as hell. Unfortunately he then has to insert the message that hurting nature is bad, mmkay, and will come back to bite you in the ass. Which is fine in and of itself, and has been explored in many films, but it's not exactly as groundbreaking or profound as he thinks it is, nor is it well-executed when the consequences come back in the form of a killer ficus and characters are running away from a light breeze.
M. Night Shyamalan should direct a superhero movie, like darker DC or Marvel.
Did you ever see Unbreakable?