Script flaw that always bothered me
When Burke arrived with Gorman to tell Ripley that they'd lost contact with the terraformers on LV-426, her first response should have been "Oh really? That's an awfully big coincidence. They've been there 20 years without incident and just happened to have communication troubles shortly after I informed the company of the derelict spacecraft? Reallllly???"
That was the first thing I thought Ripley would say, anyway, it being the most obvious question to ask. Right there the film tipped its hand too early and also made Ripley uncharacteristically stupid. Cameron should've tightened up that part of the script. Right there it's obvious that the company was again sacrificing its employees in its pursuit of alien life forms and technology. Yet soon after this Ripley is willing to trust Burke's reassurance that the mission is to "destroy and not bring back." Hey Rip, if the company's intentions were so pure and they thought there was any credibility to your story, then they wouldn't have sent ordinary Joe engineers to investigate in the first place! The justification the film did provide to explain why Ripley had temporarily turned into a drooling moron, that she could only overcome her nightmares and psychological trauma by confronting the aliens up close again, was something I found lame and not credible.