It's a bit late for a District 9 review, but any movie as astonishingly great as this one demands the love.

The Good:

• We're not really hip to the hand-held Blair Witch shaky-cam "technique", but D9 employs it to wonderful effect. The abundance of documentary style camera work helped sell a powerfully authentic, unsanitary, and gritty atmosphere. Functioned perfectly in the context of the story.
• The alien effects were positively magical.
• I have to concentrate on not thinking about the gundam-style armor suit, as it makes me weepy with joy.
• Star and first-time actor Sharlto Copley absolutely nails it (while apparently ad-libbing most of his lines).

• Some plot holes surrounding the aliens and their utter lack of motivation. "Lack of cat food + glorious future weapons" is flawed math.
• There's a switch that occurs when the story transitions from "documentary film" to "regular movie" that is a little, perhaps unavoidably, jarring.
• Nigerian voodoo. Not so good.

• I got nuthin'. As sci-fi movies go, this was damn near perfect.