I have always found Prometheus to be very unsatisfying to watch. The story and how it unfolds, the dialogue, and the characters always frustrate me. The score and tone of the film always bother me too. It wants to be epic, uplifting, and hopeful but it doesn't mesh with the story playing out. I think the trailer for Prometheus conveys the visceral tone that I was expecting/hoping for.
It is a beautiful film though with some great bits and pieces.