Watching it again last night Aliens hasn't stood the test of time anywhere near as well as Alien 3 and I never thought I'd see myself typing that.
It looks like it was made for television and the dialogue is very clunky and cheesy (more like the other sequels than the first film).
I get the impression that the only reason Newt survived so long was because the aliens wanted to stay as well away from Carrie Henn's awful screeching and terrible line delivery as possible.
It's a fun silly action film on it's own but it doesn't really work as a sequel to the first film.