Rating 10 out of a possible 10.
So according to my Movie Scale, it's as good as a science fiction movie can get. No Spoilers here.
A humanoid alien stands above a waterfall as a hovering spacecraft departs. The alien drinks a dark liquid, then starts to disintegrate. As its bodily remains cascade into the waterfall, the alien's DNA triggers a biogenetic reaction.
So yes, scientists, probing into matters best left alone get in over their heads. If you don't like that whole pretext for a SciFi movie, you won't like this one.
However, the script was smart, the direction and acting was superb and it will keep you right on the edge of your seat until they roll the credits at the end.
And I think that it's likely there will be a PROMETHIUS 2...