I just saw Prometheus. I went into it expecting it to combine the worst elements of Mission to Mars and the first Alien vs. Predator, and you know what? It was even worse than I expected. Oh, sure, the cast is solid and there are some very leet grafix along the way, but the plot sucks. From the android's motivations to the monsters' lifecycles, nothing that's presented here makes any bloody sense at all.
I read the wiki article on Prometheus before I went to see the movie, and so everything did make sense. The monsters life cycles don't make sense to you because this is a prequal - they haven't evolved into the Nostromo aliens yet.
...Still, since we're listing nitpicks, I'll add one: -Why would a robot dye its hair? If you think it's thematically important for him to be a blond for some reason, could you at least properly dye the roots so that it's not glaringly obviously fake blond when you do all those shots of its disembodied head lying on the floor.
David is begining to develop a personality. He admires and styles himself after Lawrence of Arabia - remember the movie clip? Peter O'Toole had that hair in the movie.
Oh, another thing that Ridley managed to totally screw up: the things that look like chestbursters bury themselves inside people instead of bursting out, but the thing that looks like a giant facehugger comes out of a person's body? Has this guy even watched his own movie, or any of the others, ever? SRSLY WTF
EDIT: I just realized a major plot error. The Space Jockeys left maps all over our planet telling us to come and visit not their home planet, but an uninhabited rock upon which they would later build a bio-weapons lab? SRSLY WTF...
The big change is that the Aliens are not a naturally evolved species, but a designed bio-weapon. They're designed specifically to infect and spread quickly amoung an enemy population, as we indeed observed in the Ripley movies. Each generation attacks differently.
Concerning the rock-wall "maps"; If the Space Jockeys are indeed involved in a millenial war, then they certainly wouldn't leave maps around to their homeworld. Assuming - and this is my own speculation - that they seeded the Earth to evolve a soldier-species, they would want us to show up at their base - to be put to use.
Of course the Girl With the Dragon Tatoo is off to find the Space Jockey's homeworld - a sequal to the prequal - and I'm betting that's what she finds.