Prior to seeing the film, I read an interview with the writer for Prometheus, and is really sounded like he had his head screwed on. So why was the movie such a shambolic mess?
Turns out that this writer only submitted the initial script and another one (responsible for the incoherent mess that is Lost) reworked it substantially, adding a bunch of unrealistic stupidities (like taking the helmets off) and making the movie impossible to understand.
On the positive side, there’s a bunch of analysis/speculation on what the hell was actually going on and what the movie was about. Less enlighteningly but more hilariously, the Red Letter Media review is punchy and on-point.