I wouldn't say that I'm a big science fiction fan, but I had heard good things about this movie, so I gave it a try, and I'm glad I did. It did not make for a dull evening. It began as a mock documentary about Wikus and explained how the alien ship appeared over Johannesburg and the events that led to the contact with the aliens. The aliens look like human size shrimp--in fact they humans refer to them derogatorily as "Prawn."
Without giving too much of the plot away, the "documentary" follows Wikus and his the troops from the corporation for which they all work as they attempt to evict the aliens from the slum where they have lived for the past 20 years near Johannesburg to an even worse camp farther outside the city.
Wikus becomes "infected" with alien DNA and begins a metamorphosis that is not pretty to watch. Wikus eventlually pairs up with one of the aliens (and his "adorable" child) when the alien gives him hope that he can be cured. It then becomes a bit of a buddy picture, with the two working together (for the most part) to solve both their problems--curing Wikus and repairing the aliens' ship.
I am giving this movie three sponges. I would have given this movie four sponges for the original plot that was riveting and unpredictable and for very good special effects, but the violence just goes too far. One particular bad guy just won't die no matter what happens and Wikus's character does a Sigourney Weaver move from Aliens as he becomes enveloped in a robot weapon. I thought it was too much mayhem and a shoot em' up toward the end. I don't mind violence, but it became cartoonish at a point, which wasn't necessary. That being said, I would still recommend this highly as a rental, as it is now available on DVD.