perhaps with knowledge of the 1st movie, the buildup in aliens was far more intresting IMO, seeing Ripley interact in the future, rebuild her life, and once again returning to the planet( it could be I like Cameron's pacing then Scott's). But Aliens was more of an action film then focus soley on horror. I usually compare and contrast Alien with the The Thing, be it that it has a faster build-up of 30 minutes before we first see the creature in action, it kept my attention on the screen. or maybe it I'm a little biased, since The Thing is one my favorite horror movies.
which makes me wonder, how well would Alien do in theaters today ?
back to topic, my first viewing was actually about 6 years ago, though sadly since viewing it on tv, I usually miss out on the middle of the movie due to timing. I actually got a chance to see the whole thing a couple times in 2004.