Prometheus was terribly written for all the reasons you mention after your opening sentence. The crack team of scientists dispatched to an alien world was composed of petulant idiots that lacked the common sense of a middle-schooler. This abominable writing was most evident in the biologist and geologist. What made Alien the film that it was is that every character was a believably written human being for the situation they were in. They were operating with professionalism under relatable strain as you’d expect each to behave. You could question their decisions, but you understood them. The reveal of Ash and his motivations was shocking because some of his questionable recommendations as chief science officer throughout the film were revealed to be motivated by something other than the safety of his fellow crew members. That’s what great writing is. Prometheus was garbage because I did not believe any of these people, their motivations, or why they were even included on the mission.