This wasn't the type of movie for that. Prometheus, a sci-fi mystery movie about the origins of humanity... THAT'S where leaving questions unanswered and up to interpretation is best utilized.
Was it dumbing down when Christopher Nolan used flashbacks in his Batman movies? No. I understand what you're trying to imply but you're wrong. Lack of detail is more complicated. We all got it. You're not smarter than everyone. We all saw and heard the hints about what happened in Westchester. It was the key emotional driver in this film, and they barely utilized it. There's realism and there's trying to make an emotional connection with a cinema full of people.
Also the brutality and gore just further upped the numbing tolerance.
This was a film that made you feel bored in the middle of, despite how cool it looked. Walking out of the theatre you're not wowed, just blank. Because you knew exactly what was going to happen from the beginning.
Solid film, with some great performances... But it's not on the GOAT tier of comic book movies.