I loved "Signs", until they killed the movie by showing the Aliens in full scale and made them so...stupid.
The scene you see the aliens leg disappearing in the corn field is one of the best scary movie scenes of all time.
Same for "The Village". Could have been good, but that Twist made the movie so much smaller that it looked before.
And I have to admit, that I liked "The Happening" and some of the Ideas. It's a scary scenario, with better writing it could have been great.
"Lady in the Water" is just...boring.
"The last Airbender" is the only movie, that I would call really, really, really awfully bad.
The rest is some sort of Anti-Hype that somehow surrounds Shyamalan-movies. They wouldn't be reviewed THAT bad, if the same movies were made by another director.
But back to topic: 20m would be absolutely embarassing, really. Can't believe that,