...a found-footage movie whose third act remains missing.
—Clark Collis Entertainment Weekly
For most of the running time this demon pic amps up the blurry shots and loud booming screams to signify well, not much. Read more: http://uk.eonline.com/news/movie_reviews#ixzz1in2McNax
—Peter Paras E!
...generates a fair amount of suspense during sizable swaths of its familiar but serviceable exorcism-centric scenario.
—Joe Leydon Variety
...only inspires exasperation. It's basically one big offensive gesture, which, really, is what you should expect from a movie whose poster image mirrors the universal symbol for cunnilingus.
—R. Kurt Oseland Slant Magazine
...never gets off the ground, trotting out the same predictable twisting heads and psycho-babble without a whiff of originality or discernible visual flair. As a result, the would-be thriller proves as scary and unsettling as a slab of devil's food cake - only considerably less satisfying.
—Michael Rechtshaffen Hollywood Reporter
...joins a long, woozy-camera parade of found-footage scare pictures...
—Michael Phillips Chicago Tribune
...too illogical and lame to do anything but make you mad.
—Bill Gibron filmcritic.com
The scariest thing about The Devil Inside is that a major studio like Paramount Pictures, which is distributing it, may be able to squeeze more profit out of a tedious, tediously exhausted subgenre that was already creatively tapped out when The Blair Witch Project spooked audiences more than a decade ago.
—Manohla Dargis New York Times
...plays like a horror film conceived on graph paper.
—Mark Olsen Los Angeles Times
The hilariously convoluted thriller contains all the elements for a wacky parody of exorcism movies, except a sense of humor about itself: The Devil Inside never acknowledges its innate ridiculousness, so the laughs are unintentional.
—Nathan Rabin Onion AV Club