Good, just don't take it too seriously.

Rating: 7/10 (9 June 2012)

Let me say that the movie is very good, though the other reviewers are right that some of the events in the movie are a little absurd and the background and plot are a little weak in some spots. This includes an unrealistic c-section, the character's inability to behave cautiously, a poor reason given for the trip, and little explanation for the "engineers" purpose.
However, the movie is still amazingly fun if you suspend your disbelief. We can assume that the character having the c-section was able to heal quickly because of some unknown medical advancement. The trip may have been hastily put together because Weyland was willing to cling to any possibility that meeting the "engineers" would prolong his life (this seems likely to me because of Vicker's skepticism for the entire trip). The "engineers", our creators wanted to kill us by the end of the movie. The movie doesn't explain why, but perhaps they didn't really create us. Maybe someone else created both humans and the "engineers" and they simply need to kill humans in order to make Earth their home. Maybe they chose to do this with a biological weapon because it's more efficient or because nuclear weapons (if they have them) would make our planet uninhabitable.
Two minor things bother me about the movie. The scene in which a head is brought back to the ship and is tested by Shaw should have explained her background better. We only know that she has an archaeological background, but she is testing the head like a biologist or anatomist might. I also didn't care for the fact that the ending blatantly lets us know that this is an Alien prequel. But hey, no big deal, it's a fantastic movie otherwise and is one of the few movies I think is worth seeing just for the effects.