I rewatched Prometheus last night...it wasn't as bad as I remembered, but the unforgiving issues I have still concern the stupid character choices, the humanoid engineers and the crudely edited finale.
Is it possible to salvage the mystery of the Xeno and the Engineers? Yes. Just please don't let the Xeno's be a human hybrid made by David's experiments with the biomatter, and please let the Engineers be themselves mere servants to a higher, more "Alien" being.
The last thing we need is detailed explanations, excessive exposition of who and what these beings are. Imagine how creepy the briefest glimpse of another intelligent creature could be - a master in the shadows, letting his beasts wreak havoc.
Of course I'm delighted there's a new movie arriving, I'm just more or less convinced the enigmas of the original film will be diluted, if at all present.