I'm listening to it right now, and I think this score isn't as impressive as they say. I think it's a little boring. Only a couple of tracks really worth it. But, at least, is not irritating, as some of the soundtracks I own.
I'm also listening to it right now - While it doesn't have melodic-tunes like Aliens (Main Title, LV-426, Combat Drop and Ripley's Rescue) into the music itself, it is still a good one - very dark and pessimistic (don't know how to spell it).
I can only say that I love it.
Right now (as I'm writing this) I hear CANDLES IN THE WIND (I love the ending on that)