Others have said it, but I'll underline for you the fact that "The Messengers" is a totally unoriginal movie. It's not exactly a bad film - it's well executed, beautifully photographed and the performers do well with a lame plot and a wooden script - but it's just a rip-off of so many other movies. This is not homage, it's creative bankruptcy. It draws ideas from everything, from "The Birds" through to "Poltergeist" and "Cold Creek Manor" (which ironically also featured a much younger Kristen Stewart in a less thankless role) and uses all the clichés in the contemporary horror film-makers' book - and then uses them all again! The effect of 'creepy' figures crawling in fast motion over the ceiling has just been worked to death. It wasn't scary the first time, and it's just plain silly now.
With this sort of film 'less' is definitely 'more'. Here, 'more' is 'way too much', especially with its soundtrack. I lost count of the number of bangs, jolts and musical 'stings' just in the first ten minutes. This audio example of stating the obvious is wearing on the patience rather than the nerves. It doesn't make you jump. Instead you groan and sigh, thinking "give it a rest". In fact, the film would be far more effective if you turned the sound off altogether and just watched the pictures.
This is a horror film for people who've never seen one before. For them, it might just work. For everyone else, there are much better ways to spend 87 minutes of your precious time. For example, you could watch "What Lies Beneath" which is so quiet that, when you eventually do hear a pin drop, it really IS scary!