warcock: Children of Men paints what feels like a fairly realistic, atmospheric near future. Mankind is on the brink of extinction, and not just because of the sterility issue. The movie is increidbly immersive, and really, really nice looking.
Despite having a science fiction/speculative setting, it touches on a number of relevant themes, from religion, to terrorism, and to how near mankind is from destroying itself at any given moment. Despite dealing with Heavy Things, the movie never feels particularly preachy, though it does walk a fine line. Also, despite dealing with heavy things, it's doesn't feel like a particularly heavy movie. It spends some time establishing itself (this didn't bug me because the movie looks great and is very immersive, although some people apparently think it's too long), but once it gets moving, it's really a stone's throw away from being an adventure movie.
The actual plot, the movement of the story, is really fairly thin. I felt like the whole purpose of the movie was to give me an overview of this near future, realistic world. The whole movie feels really real.
Performances are fantastic, all around, and there are even some great action sequences, most notably a great gunfight towards the end. And the whole movie looks jizzingly awesome.