You know, his films have not really had that many 'twists', in the truest sense of the word.
* Sixth Sense = had a twist in the true sense of the word, in that it turned the story on its head.
* Unbreakable = had a twist, but it was much more of simply a 'reveal'.
* Signs = again, the 'twist' is more of a 'reveal'.
* The Village = it had a twist, but a subtle one, and when you consider inspiration by real isolationist, closed communities in the USA, again, it is more of a 'reveal'. I think, if the Village had had a more sensational and direct climax and denoument, it would have appealed to the masses more.
* The Happening = more of a reveal, especially considering the inspiration of various 'mind control' predation and defense techniques already in nature today. EG, some bacteria drive caterpillars to suicidal behaviour, so that the caterpillar is eaten by birds and the bacteria can grow and travel. IF the film had shown some kind of CGI 'fungus chest explosion' or something, film goers would have probably accepted it.
My theory is that after Sixth Sense, a lot of film goers felt a bit miffed, that rather than THEY being the ones picking holes in the story, THIS TIME the movie picked holes in THEM. We have fostered a film going culture which revels in being 'better and smarter' than the film makers. Finding the 'errors' and generally watching films as if in competition for it. It is an attitude which resists immersion quite stubbornly.
Perhaps we have been spoiled. Perhaps modern culture has made us far too cynical and literal. I think we have far less patience for the metaphorical, and there's clear HOSTILITY towards intellectualism and so-called 'pretentiousness'. The latter being the go-to accusation for films which challenge expectations or dare to explore the medium.
Regardless, there are tall poppies in film today, and they are the targets of vilification and ridicule entirely ill-proportionate to how objectively 'bad' they may be. Often, the negativity is unwarranted, or it is negativity which is obviously applied quite inconsistently. If you a film maker who toes the line and makes competent but otherwise unadventurous, derivative product, you'll be liked, even loved. Yet if you a film maker who takes creative risks, you will face incredible resistance from film goers.