It is hard to say too much about Prometheus without spoiling it. First of all, those expecting to see the original Aliens are not seeing this movie for all the right reasons. Yes, it is part of the Alien universe and set before the first movie, but it doesn't feature those Aliens and instead tells a brand new story of merging the two worlds together.
With Ridley Scott back to directing, Prometheus used the similar setup of making researchers explore an alien world, only this time there is a longer setup and more suspense driven to events unfolding. The ship in this movie is very reminiscent of the one in Alien, although it is different in design and has some new interesting gadgets and pieces of technology we haven't seen before. There's no denying that there are things people will pick up relating to Alien, and I'm really glad they didn't tone down the violence for 12/PG-13 rated audiences. Either way, you can watch Prometheus first before the other Alien movies.
On the acting side of things, I found Michael Fassbender's Android character David to be the standout for the movie. I also liked the protagonist Noomi Rapace and the supporting cast of Logan Marshall-Green, Charlize Theron, and Idris Elba. All strong performances, but perhaps if there's only one small complaint I could think of, is that maybe the supporting characters didn't get enough development time. Thankfully, Scott and the team keep the movie going at a very good pace with emotional depth at the right moments.
Overall, Prometheus on first viewing was what I expected, a movie using it's original base movie Alien as a structure to produce a new story with new characters/lifeforms to lead up to other Alien story lines. It is highly likely the references will become more obvious in sequels to this, but Prometheus manages to bring a story that works as a standalone but also a prequel at the same time, which is good for all viewing audiences, and I think Scott was trying to bring the grisly/dark atmosphere movies of Alien without being too in your face, which I thought was the right direction for this movie.
