I think it is the typical story of the original, creative artist who gets satisfied for whatever reason (money, acclaim, etc.), and then just gets flat or worse. Trying later, in some way, to capture what originally made his movies worth watching, but failing. His first two movies were good (6th Sense was damn good, IMO), I thought Signs was overly-gimmicky and ultimately a silly movie, though he could create suspenseful moments at that time. And I haven't liked anything else since then that I've seen.
Same thing happened with Metallica.
Same thing happened with Metallica.