AVP had a single, really cool shot: the ice breaker approaching the whaling village with the wide open starry sky. Great visual reminiscent of the sun-setting ship shots from Alien and Aliens. And it had one really cool set: the whaling village frosted over. Other than that...so sad. I choose to ignore this one.
AVP:R, on the other hand, felt so much like the more entertaining AVP books, I couldn't help but enjoy it. The hard R was a big help too. This one exists in my personal cannon for the two franchises, whereas Aliens 3 is a Ripley cryo-nightmare.
A:R is very proto-Firefly and quite fun. The tone is odd at times, but again, I like this one. It's fucking weird, but still good. I wish Whedon had been able to helm the project and control scripting. I bet it would have been awesome, if he had.
As for "xenomorphs", what else would you call them? You can't just say "aliens", because Aliens establishes humans have come into contact with numerous other alien lifeforms, just none with the characteristics Ripley describes. Lower forms of alien life are so common the marines bemoan going on yet another bug hunt. There's also the issue of naming them removes some of the mystery surrounding the species. In the Predator books, they name the Predators Yautja and it's as lame and disappointing as it sounds.