I saw it last night and it was indisputably the best movie I've seen this year. The story was excellent and they kept the idea of aliens living among us very grounded, almost to a realistic point. The choice of Johannesburg as the movie's setting was very good, even though it's inspired by the Apartheid Era in South Africa concerning District 6 in Cape Town. Yay, I know history! The lead actor Wikur or whatever, I would really hope to see him appear in more movies in the future, he was really good! The 3D was excellent as well.
Glad Blomkamp got to make this movie instead of the Halo movie.