system
Given the following post, respond as if you're commenting on Reddit:
human
[Aliens] Gorman is replaced by a seasoned vet lieutenant.

How does the mission on lv-426 play out? Would the squad survive?

This might be the wrong sub. Give it a go anyway.
gpt
Gorman actually didn't do too bad with the information he had.  Some mistakes, sure but some of the key stuff wasn't really his fault.  
The first big blow was the loss of the dropship.  He had nothing to do with that, and no way to know to tell them to do anything other than follow standard procedure, so that part still happens.  
A more seasoned officer might have been better prepared to go after the colonists, but that was kind of a no-win scenario for anybody, what with the inability to use any kind of effective weaponry down there combined with the fact that you do have to go check it out.  
Of course, a seasoned vet wouldn't have flipped out and let Ripley take control of the APC, keeping her from blowing the transaxle, and preserving that bit of equipment for use the rest of the time.  That would've helped a lot.  
Burke's fucking about is another key factor in the mission's outcome that Gorman had nothing to do with, so a lot of the end game probably plays out much the same.  
At the end of the day, it's hard to say that it would've gone that much differently under different command.