I've seen it, I liked it, I would watch it again,.....
At first I couldnt quite reconcile the first scene where the Engineer essentially sacrificed himself. However, I suppose it was an act to seed the planet with varied life using the Engineers DNA as a base. Death to bring life. Presumably only to return and destroy that life later. I guess the intentions of the Engineers were never really addressed.
The ending seemed to suggest the possibility of another movie with Elizabeth Shaw (Noomi Rapace) and a damaged David (Michael Fassbender) taking an Engineer ship and going deeper into Engineer territory, .or to the next engineered planet.
I really liked the original Alien movie although it is a little tame (slow) by todays standards and somewhat dated with respect to special effects. I really liked Aliens as well.
For what its worth, my Wife and I caught a matinee of Prometheus in 3D. We were going out of town and she said we had time to see it before leaving and she knew how much I wanted to see it. Shes a good sport considering its not her type of movie.