This article is unfortunately pretty spot on. I'm not in the "disappointment" camp, but the more I think about it the more this movie and the reaction remind of The Phantom Menace. I have a feeling that I'm currently rationalizing my fondness of the film based on Sir Ridley's reputation and my enjoyment of his other films, but in a couple of years I might view Prometheus more negatively.

http://www.forbes.com/sites/daviddisalvo/2012/06/11/review-prometheus-is-a-visually-stunning-epic-failure/