This book rocks! I work in a library and naturally read a lot, not just scifi but all kinds. This book was good enough to stand alone and still be good.
The story is orginal, compelling, and the characters have depth. The book was the best in all the series. I've read all the AvP books, most of the Aliens ones, and half the Predator ones, and this was the best.
Fans should check out Hunter's Planet. It was a good book, but not as good, and it got kinda weird, but its still okay.
War, the 3rd one, took place in between the first 2, and totally sucked. It's incredibly anticlimactic to read in order.
I also recomend the Perry's Alien trilogy, as well as Aliens: DNA War, the first new one by Diane Carey. Have yet to read her second though...