AvP2 made Monolith's perspective on Aliens very clear -- strictly cannon fodder. Why the player Alien is so special is unclear, but every other Alien in the game, perhaps excluding Queens, aren't much of a big deal.
AvP2010 was more generous here. They used the darkness, baited you, had quite a lot of health and did significant damage in a small amount of strikes. I didn't get the impression that Six was much different than any other Alien, simply that she had the opportunity to observe the capture of her siblings and react to that, putting her down a path where human beings implicitly fed her information about themselves.
Kind of ironic, really. Because the Six was doted on as "special", she was exposed to more human behaviour and -- as per the AR example of learning that the early game explicitly draws on -- she used the knowledge her captors freely gave her to get an edge over them that other Aliens didn't. You have Weyland's speech about meritocracy to support that, which implies that Aliens learn on an individual basis. The hive being a "meritocracy" is a concept I really like, even if the Queen molting thing damaged Six's cool factor.