The problem with Shyamalan is he became a one-trick pony. All his films boiled down to establishing a comfortable calm through a meandering exploratory story and then slapping a "startling" twist on the plot towards the latter third. He would have done well to study Michael Crichton's "Coma" which engages not only the twist, but the masterful use of the thriller genre's plotting and pacing.

I dare say "Coma" is one of the finest examples of how to properly plot such a movie--a template, even, to strive for.

Both filmmakers wrote in the same genre, but Crichton was a true master.