So here's my doubts. Hadley's Hope had 158 colonist I assume including kids. That should mean, more or less 158 Xenos roaming around when the Marines showed up I guess? We factor in some casualty from the colonist defenses, maybe 155 or even 150. Situation is still pretty bad...
If you don't factor in those marvelous automatic sentries from the special edition, it course: 500 rounds each, automated fire and aim control, in an open corridor. Let's say 5 to 10 rounds to down a target each... They could have take care of the whole damn hive by themselves!
Just a quick thought, I was watching the movie.
there is a book out there, Alien: River of Pain
that tells you exactly this story.
there were 158 colonists
1 newt (who was born there...)
3 weyland yutani scientists,
and a whole squad of marines who were there to protect the colony...
In that book wey yu already knew the derelict ship was there, and founded the colony to get access to the aliens... that's why the marines escorted the colonists out there everytime they were scavanging/exploring.
well not all of the colonists were captured and impregnated with alien embryos...
when the xenomorphs took over, many were just ripped apart and killed
so all in all... i'd count about 1/3 as casualties.
and about 11/12 of the rest 2/3 as hosts...
later in the book one surviving girl, one scientist, captain bracket and some marines finally made it to orbit and escape the planet only to leave newt behind who hid in the air vents and the last line pretty much states how hicks and hudson and co find her leading to aliens 2.
I don't need a fancy signature quote from some dude, everything i say is pure gold! ~ myself