Movies are not about solving problems, answering questions or curing cancer or connecting the dots of reality.
Movies--at their very best--are about Art.
Art changes us in some way. It can make us uncomfortable. It can make is think or search or merely experience our own emotional values.
Sci-Fi generates ideas which, then, we or others can explore as a launching pad for genuine creation/innovation in real world settings.
Remember Flash Gordon in the 30's or H.G.Welles novels before that? Such creative ideas spawned technological advances by planting seeds that flourished in the human imagination decades later.
What is it Sir Isaac Newton famously said? "If I have seen farther than others it is because I have stood on the shoulders of GIANTS."
Prometheus gives us real giants!
Would there have been a space program in the U.S. if not for the foundation of sci-fi?
And were it not for the technology developed trying to beat the Russians and get to the moon and back---would we have tiny hand-held iPhones, internet, Wi-Fi, laptops, HD TV and Blu-Ray, miniature circuits, etc. etc. etc.??
Prometheus isn't a template movie where you plug in characters and go from A to B to C and have resolution.
Deeper (and Spiritually themed) issues are explored. (Not nailed down.)
The Engineers were self-sacrificing Johnny Appleseed altruists spawning ever-evolving life forms.
But, Evil appears when non-self-sacrificing life forms evolve and taint their Elixir with mutation.
The creators are destroyed by their own creation. (All but one, apparently).
This means the Creator's impulse is to regret.
This film's central theme takes place on Christmas. Keep that in mind.
We have a sort of Virgin Birth episode after a chilling Annuciation. Slaughter of the Innocents and, if not a Crucifixion, a sacrifice of lives
to prevent the extinction of others.
I saw the film twice.
The first time I was clueless.
I read interviews with the Director and writers.
Then, I saw it again with a basic knowledge of the "Religious" undertones and enjoyed the hell out of it more knowingly.
Your mileage may differ according to your preconceived expectations and values....