"There are, Mr. Cuarón suggests in “Children of Men,” different ways of waking up. You can either wake up and close your ears and eyes, or like Theo you can wake up until all your senses are roaring. Early in the film Theo and the restlessly moving camera seem very much apart, as Mr. Cuarón keeps a distance from the characters.
Every so often the camera pointedly drifts away from Theo, as it does with the dead policemen, to show us a weeping old woman locked in a cage or animals burning on pyres. In time, though, the camera comes closer to Theo as he opens his eyes — to a kitten crawling up his leg, to trees rustling in the wind — until, in one of the most astonishing scenes of battle I’ve ever seen on film, it is running alongside him, trying to keep pace with a man who has finally found a reason to keep going."

-Manohla Dargis, New York Times.