I haven't seen lots of documentaries, but this was one of the best ones I've seen in years. The film portrays the poor, homeless, and drug addicted citizens of Bombay, Mexico City, Moscow and New York City. Some scenes are so realistic that I wondered how they were shot - e.g. some of the scenes with the heroin addict in New York City.
Seeing a film like this also makes you realize how many people's stories do not get told by Hollywood films. When is the last time you saw some mass marketed film about a mother who strip dances to feed her children? Or a man who shakes different colored paint through a sieve for a living? The only other film I can think of like this was Hoop Dreams, but that at least dealt with young people with a chance to make something of their lives. Megacities deals with those who didn't make it and never will.
Yet some scenes aren't completely depressing. There's a DJ in New York City, asking his listeners to describe how they survive in the city. There are children in India who take turns watching an Indian soap opera. Finally and most disgusting, there's a scene with a whole barrel full of chickens whose necks have been broken and throats slashed but yet still move around and splatter their blood against the wall.
I'm surprised that so few people have seen (and thus voted) this film, especially considering it won awards in three continents. If you get a chance to see it, do, but be forewarned of its vividness.
10/10