Exploring the overall plot from Alien to Prometheus is fascinating. http://alienseries.blogspot.co.uk/2012/04/space-jockeying-part-1-pilot.html
www.prometheusnews.net/movie/fan-reviews, http://alienseries.blogspot.co.uk/2012/04/bad-alien-reviews.html
I like this review at, alienseries.blogspot.co.uk/2012/06/prometheus-review.html, there definitely seems to be a lot of potential for more editing, along with some added scenes.
For instance, there are 7 Versions_of_Blade Runner. http://web.archive.org/web/20090319034524/http://www.scifi.com/sfw/column/sfw17153.html, http://www.philipkdick.com/films_bladerunner.html
Any blu-ray, home_video_release should provide an extended version of the Prometheus-movie. I hope that someday there could be a 3 hour version of this fantastic giant of a movie. However, that remains up to this visionary director. www.prometheusnews.net/movie/no-directors-cut
I also like this review. www.prometheusnews.net/movie/jonesycatpants-reviews-prometheus/
Prometheus is quite a cautionary blend of biology-robotics & other classic sci-fi elements.