When it comes to the Alien franchise you need to do 2 things.

Remember that Alien is a straightforward horror movie and that Aliens is a straight up action movie with horror elements. The two exist in the same franchise universe but as movies are basically separate entities.

There are plenty of stories out there about how Ridley Scott (who created the franchise and original film) disliked the way James Cameron took the whole Alien entity in a different direction. His original vision had nothing to do with a hive like mentality, with a queen alien and so forth. So to enjoy both movies you have to look at them separately within the same universe... Confusing I know, but essential to get the most enjoyment out of both films.

It starts of very nicely, aping the opening feel of the original movie, and the pacing of the first act is slow and methodical. It shows that the 'company' is more concerned about it's profits than it's employees (sound familiar) and is more than willing to scapegoat the only survivor (we find out why shortly after).

Please note that I own and will only watch the directors cut of this movie. I think the extended scenes, added exterior shots and information about how the company sent out some of the settlers to see if Ripley's story was true... Adds a great deal to the viewing enjoyment and I highly recommend that everyone watches it.

By the end of the first act, we have found out that a family was sent out to the crash site from the original movie, and that one of them was attacked by a facehugger... and that contact with the colony on that planet was lost... So a rescue team is on it's way to investigate and they want Ripley along as an advisor/consultant.

The special effects for this movie are pretty damn good considering it's from 1986, James Cameron makes a lot of use of miniature sets with lots of attention paid to details. So the viewer finds it difficult to tell where the miniature set ends and full size begins.

The action and tension begins to get ramped up, there's some great dialogue and friction between members of the Marines and once again female characters are not only present, but there as fully fledged characters, not just some pathetic love interest to fulfill a plot requirement... and of course Sigourney Weaver in the lead role. It's one of the reasons that the Alien franchise has survived 4 films and it's entirely down to her character. The performances of the cast is excellent, the FX are great for the period and the buildup to the final conclusion works really well... and of course has led to the often used quote 'Get away from her you bitch" in many other movies... parody or not. It's become part of pop culture in the same way as Vader telling Luke that he's his father has (albeit to a lesser degree). You mention that line, and people know what/who you are quoting.

I've lost count of the number of times I have watched and purchased these movies over the decades... I owned them on VHS in widescreen directors cuts, then the 20th anniversary 5 disc DVD boxset... then the 25th 9 disc DVD boxset and now I have them on bluray.

I will not however be buying them again in 4K when they inevitably get released again... These movies, the original Star Wars trilogy, Terminator & T2 and The Crow are movies I have spent far too much money on buying again and gain over the years.