I saw
District 9 this weekend, and it was great. I was emotionally moved almost to the point of tears, and almost to the point of nausea (it's gorey. You have been warned). All spoilers are behind the cut.
I knew from the commercials that I was going to sympathize with the aliens ("prawns") who seem to be held captive by the military, who wants to know the secret to their amazing weaponry. These powerful weapons are like nothing we have on Earth and they seem to be biologically engineered.
The Prawns didn't come here to conquer. We're not sure why they came. They first live among humans, but like many refugee populations, they don't fit in. They don't understand the human boundaries and laws and they have gross habits like eating raw meat, and eventually the humans demand to have the Prawns removed from human society. So now the Prawns live in a refugee camp. They're scared and poor and lonely and many act out. The government hires a corporation to deal with the problem. Guess what? They fuck it up. I'll leave it at that.
I liked how the movie was sci-fi but not super nerdy. It didn't try to explain everything and to some degree, you just have accept the science aspects for what they are. It was more interested with the human side of the situation, which was handled wonderfully IMO. It explores the grey areas that inevitably occur in human interaction (and alien interaction, apparently). In fact, most humans don't wish the Prawns harm, they just want them to go away. When the movie shows some of the behavior of some of the Prawns, you totally understand why many humans didn't want to be around them. Then they show you some of the motivation behind that behavior, and you understand the Prawns better too. I'm a pretty empathetic person so I expected to feel for the aliens, but I still feel a lump in my stomach thinking about some of the scenes.
Behind the cut is some more in depth commentary, please read only if you've seen it or don't care if you're spoiled.
( commentary contains spoilers )