Well, I'm a bit late for this, but I just wanted to add something...
I didn't like District 9, as much a some people that is. I found it rather dull and documentary like(maybe that is what the director was going for, who knows). District 9 is as much of a movie to as much Heavy Rain is a game.
All that I'm trying to say is that I personally think that D9 was meh. I would consider it a rental/download to some degree. I have actually had some arguments with people about what movie is better, Avatar or D9, and I must say that I pick Avatar. Fine, call me a little kid, a dumbass who doesn't understand a good movie when he sees one etc. but I think that when D9 stepped into the pool of realism; it went a little too far and drowned in it's own piss.
The only part I actually liked is the little cute alien that want's to help the human.
Another thing I am trying to say is that I am getting bored of the "realism" thing most movies have. District 9 was decent, and if you like that kind of movie then go see it I suppose, but if you are like me then I would recommend you to save your money and go see Avatar(in 3D or 2D, either way it's awesome) instead.
I would also like to add that this only me personal opinion, as opinions are different form person to person.
Please don't kill me...
All and all, D9 was really freakin' boring and I didn't like it. End of story.