I mentioned in the voting thread that one of the reasons I love this movie is because of the cinematography. The single-shot sequences are absolutely incredible; just pulling some facts from Wikipedia the three longest are 3:19, 4:07, and 6:18 though I think the most powerful one is at the one hour ten minute mark where Theo and Kee are "breaking in" to the refugee camp. The camera following Theo through the winding entrance just put me there with him.

Besides the cinematography in the movie, Children of Men has one of my favorite protagonists in film. (I'm probably going to mess up explaining this, so bear with me.) Theo is the protagonist in a very gun heavy movie who never uses one himself and this carries over from how his past is described by the other characters. I believe it was Julian and Jasper talking to Kee about Theo's past explaining how he was a very active activist and a pacifist as well and Theo keeps that activist/pacifist mindset throughout the movie which is just fantastic. His character has such a staunch contrast to everyone else, I love it.

And just a little fun fact my dog is named after Jasper in the film.