Rewatch Aliens today, since it had been awhile. (I had also been watching a documentary about the preproduction stage of Alien, so that whetted my appetite.) Honestly, maybe Cameron makes more money on his films today than before (although he was always making money); but I still think story-wise his tightest stuff is in his first few films (aside from Piranha 3d).
Like, he just has such a solid blend of truly tense and entertaining action beats, strongly defined characters (you can summarize them each in a line or so), and emotional arcs for most of them -- and no one was as good as him in his early career at establishing internal explanation and continuity so that his stories never felt like cheats. Great example is Ripley showing off that she can use the loader early in Aliens, so it isn't like the end set piece is pulled out of someone's ass -- we know she's skilled at using the loader, and we even see the loader earlier in a ship establishing shot before everyone wakes up. So we can believe she has a shot against the Alien queen. Not only that, but he does it in a way that serves a purpose in that early scene, so we don't even know he is doing this at the time; it establishes that Ripley, even if she's not a trained marine, can contribute to the mission in a practical and isn't just a "useless consultant" plus builds her own confidence at being valuable on this mission. he does this a lot esp in his early films, so it all feels natural and coherent rather than forced.
he's also great at playing off what the audience knows. We're horrified by one alien from the first film, so Cameron keeps dropping clues there are far more than one here. We know Ash ended up being a Company tool, so this plays into Ripley's prejudice against Bishop, which he reinforces a few times (she really throws shade at him halfway through the film, so we know she doesn't trust him, and we're not sure we can trust him either) until Cameron flips it around and we realize Bishop was always trustworthy after all.
The big thing is just setting up Ripley as a victim of trauma, and she ends up having to face it in order to get through it -- and in the meanwhile both she and Newt find redemption in each other since they've each lost a mom or daughter. Newt has trouble trusting that anyone will ever be able to be there for her again, while Ripley has failed with her own daughter and wonders whether she can ever truly be there for another... and this is what makes the end of the film so wonderful. And why I can't really view A3 as more than just a random tangent in the nature of alternate reality fan fiction.
And all the mini arcs -- Burke's slow reveal of his true allegiance and the outcome her deserves, Vasquez and Gorman's arcs intersecting resulting in a patching up of that anger/frustration (so to speak), Hudson moving from whiny fearful bitch to some final moments of crazy heroics, the really touching moment when Ripley pauses to say goodbye to Hicks... and he corrects her to share his first name, where she makes herself vulnerable and shares hers, and he tells her to "not be long." (It's a few short words but it embodies so much deep emotion.)
I dunno, it is such a perfect film aide from a few special effects shots that are just artifacts of the time period (typically small ship shots that you can tell are models against a matte or other background) that could be fixed today pretty easily.
I know I mentioned it before, but Horner had cribbed Gayane's Adagio for his opening/closing themes for this film -- the piece was also used in the middle of 2001 Space Odyssey. I don't think it was verbatim, but close enough in how he worked it all in. I would bust on him for that, but it's kind of longing and lonely and haunting in the depths of space, so... still works.