Neill Blomkamp made a big noise with his first narrative feature, and one of the things that made "District 9" so electrifying was that it seemed to come out of nowhere. It was a surprise, and it was a fresh take on science-fiction during a period when it felt like there wasn't much being done in the genre.
The hard part about coming out of nowhere and surprising everyone is that you can only do it once. His second film, "Elysium," had the crushing weight of expectation on it, and Blomkamp stumbled in the execution. It's certainly an ambitious film, and he's just as technically adept as he was in "District 9," but he wasn't really able to pull all of the narrative threads together. One of the common elements between the two films was Sharlto Copley, the hero of one film and the villain of the other.