I can't be arsed to read all the posts, so I'm just gonna go ahead and say it: District 9 is
completely awesome and not for the squeamish.
I loved how it crossed documentary style with a sci-fi horror action film. And the production design was fantastic. Everything looked so good, and the suspension of disbelief was minimal. There are aliens, so you're already predisposed to suspend belief for them, but the rest of the scenario is incredibly plausible, and so horrifyingly realistic.
And the whole movie pretty much took convention and turned it on its head. The documentary-like style crossed with sci-fi action horror is something I've never seen before. The standard tropes of "Aliens are the Big Bad" or "Aliens are the hippie flower children" were told to **** off. Instead, the Aliens were just like us, and were the good guys. And the weapons. Oh god, those weapons were fantastic. Bugger all to your standard Sci-Fi laser gun that leaves no battle damage, those things were balls-to-the-wall insane. My favorites have got to be the lightning guns (seeing people explode was surprisingly satisfying), the "Force Thrower" (the one that saves Wikus from the War Lord that pushes people through walls), and that one gun that picks stuff up and shoots it with massive force at its enemies (most notably used to launch a pig and push a guy through some corrugated tin shacks).
And then there's the fact that the heroes aren't perfect. Hell, Wikus's own anger ****s things up when he leaves Christopher to the hands of that evil-ass colonel as Wikus takes off in the command ship. He also wasn't your generic good guy from the beginning. He slowly evolved into the roll, and even then he wasn't perfect.
The Acting. Damn it was fantastic. Especially on the part of the Colonel. He was so evil, I found myself rooting for the Gorramn bullets flying towards him. Literally, I was thinking "GET HIM! GET HIM IN THE HEAD! NOOOOOOO!!!! USE THE MOTHA****IN' LIGHTNING GUN!" And then he died getting torn to pieces by the prawns. Most satisfying death by monster ever.
District 9 just one-upped every Sci-Fi movie I've seen. I don't think the Science Fiction genre will ever be the same.