Let's start with M. Night Shyamalan, i think that some of his movies are on, and some are of, he created a masterpiece and he fall down since that, the quality is getting worse and worse with each movie, but i think the happening is the place where all started.
The story, was dull, and had no imaginative, in fact it was very stupid, which leads me to the first question, at what point did Shyamalan think that his story is going to work? because such a story wouldn't cross the line of being boring even if it was executed by martin scorsese, never in my life that i actually watched a story and felt insulted by it, it was like Shyamalan was deliberately trying to make the audience feel stupid and he succeeded.
Now, the performances, to be fair, Mark Wahlberg was trying, but with such script, it's just too painful, i mean watching him squeeze his face to 'feel the moment' or 'make an appropriate face impression' was so painful, i decided to stare at the wall while he do that, and then comes Zooey Deschanel, who made a career being beautiful, but below that pretty face, comes nothing, no talent at all, i was insulted by her performance, which took the movie into a new level of suck-ness and John Leguizamo didn't help, he just took that level of suckness and maintained it.
Shyamalan did try to present an atmosphere, but it didn't work at all, the story was off, so it don't really matter what he does, it wouldn't work either way, instead, everything felt forced, like when he try to thrill you, it made it awkward, and when he tried to scare you, it made it even more awkward, and when he tried to make you laugh, i was already bored and out of my mind, which leads me to the 2nd question, at what point did Shyamalan thinks that it would be a great horror being the villains are trees?, and did he try to deliver a 'message' with this story?, it's like 'the trees will fight back against human treatment of nature' or something, which is like the new level of stupidity that haven't achieved before this movie.
Overall, it's just a bad movie, and it's not even 'bad that it's good' kinda thing, it was bad that it's insulting, because at that level of stupidity, you can't feel entertained, watching too many people scared of something that isn't scary was painful to watch, this movie wouldn't survive even if i watched it with 10 drunken friends, THAT'S how bad this movie is.