I was going to write a proper spoiler filled review but then others have said what I think with much more precision than I could hope to so I shall simply point you towards Ebert's summary as a reflection of my own thoughts:
"Ridley Scott's 'Prometheus' is a magnificent science-fiction film, all the more intriguing because it raises questions about the origin of human life and doesn't have the answers. It's in the classic tradition of golden age sci-fi, echoing Scott's 'Alien' (1979), but creating a world of its own. I'm a pushover for material like this; it's a seamless blend of story, special effects and pitch-perfect casting, filmed in sane, effective 3-D that doesn't distract."
— Roger Ebert, Chicago Sun-Times
So instead of a review I'm still going to talk about very heavy spoiler material so if you haven't seen the film you need to leave now or don't blame me when you go all: awwwww man you've ruined the film for me now".
What I liked most about Prometheus is that it's the kind of film that gets you thinking and theorizing which is what good science fiction should do. Plenty of ales will be spilled in animated discussions regarding how this film fits into the Alien universe and what does it all mean in the end.
This is an awesome thing and if you didn't really understand everything in the film don't despair because it gives you the opportunity to do a little thinking of your own whilst you consider what you think.
Here's what I think.
The Engineer at the start of the film next to the breathtaking waterfalls is clearly on Earth and his spaceship is leaving him behind. Now he takes out the black goo and drinks it all down. I don't think that he was surprised that this is what it would do, my interpretation of this is that the black goo is derived from the Xenomorph and performs exactly what it was supposed to do. Which is to break his genetic structure down to seed the ocean with the beginnings of life as we've come to know it.
The Xenomorph is seen very clearly on the spaceship later on so we can surmise that the species in fact already exists and that the black goo is produce from their stock of them. Like all human'ish species they also use the "animals" for a multitude of other purposes amongst which some would suggest are bio-weapons (probably those worm things - I haven't quite worked them out yet).
Why would the Engineers want to wipe us out?
Well we could be considered smaller more fragile versions of themselves, maybe this is what they consider a failure. Imagine tiny little versions of us waking us up and thrusting old tiny people at us demanding to be made young again, I'd rip your robot's head off too.
Plus I'd want to get a hurry along to wipe out the Earth because you little bastards are obviously off world now infecting the universe with Fassbenders... mmmm Fassbenders.
I did want to mention how much I enjoyed Charlize Theron's performance, a surprisingly complex one caught up in father issues and sibling rivalry compounded by the fact that your sibling is a Fassbender robot. The scene with her confronting him in the hallway smacks of brother and sister which I think was very clever.
Did you note her very expensive medical device was calibrated for men and not for her so all along that habitat was for her father and not her which is all feeding into the Father issues even more which says a shit load about her character.
So why did David infect the dude with the black goo? I originally thought that it was because he was told to by the old guy in his sleep but now I think that he infected him for shits and giggles. Well not exactly shits and giggles but I do think it was self motivated after the stunningly brilliant conversation between him and Halloway about their respective creators.
Was the planet the same one that was in Alien and Aliens? No it wasn't, it was on a different planet it's probably just a design flaw that when these things crash land they end up looking like a horseshoe.
Now the most important thing to come out of the film is Milburn's hoodie. I must have one because it's super cool and it would make my life complete and I would be very happy in one. Here is an artist's impression of this joyful moment:
So that's me done for the time being if you have any other ideas or theories for me to consider please leave them in the comments and we'll have good ol crackpot theory fest!!