It is a bit patchy, yes; in some places it feels like they were making up the script as they went along, and in some it feels like they filmed one thing, then decided to go in a different direction when they edited it. Also, there's no real balance between the emotional drama of the first half and the blood splattering action of the second half, but that's old news. It's still the film that's had the biggest impact on my life, mostly thanks to the splendid performance of Sharlto Copley.

(There are no automatic alien subtitles in the non-subtitled version? Weeeird.)

By the way, have you heard about a film called Iron Sky? It's a Finnish crowd funded film about Nazis. IN SPACE. See it if you get the chance, it's hilarious. :D