...isn't half as thrilling as that 1959 classic [Twilight Zone episode about a bookish bank clerk who becomes the last man on Earth], but it is creepy enough to make you hope the theater parking lot is brightly lit.
—Chuck Wilson Village Voice
...a generally nifty little horror flick...
—Manohla Dargis New York Times
...solid, serviceable spooky saga with enough intriguing undercurrents to compensate for both a dearth of spine-tingling tension and uneven lead performances.
—Nick Schager Slant Magazine
...does work well as a kind of mood-piece, observing all the ways we surround ourselves with the illusion of warmth and security, before the shadows creep in.
—Noel Murray Onion AV Club
Brad Anderson's creepily effective low-budget thriller may not have a punch line worthy of your typical "Twilight Zone" episode, but it otherwise gets the job done in under an hour and a half with a good cast.
—Lou Lumenick New York Post
There's little hope to the film right from the start.
—Chris Barsanti filmcritic.com
...a zombie movie without the zombies.
—Owen Gleiberman Entertainment Weekly