Aliens can be quite divisive. Some people like the very clean digital look but I prefer the Blu-ray release which has quite a lot of natural grain too it. But if you compare editions, you'll see that over the years, with each release, Cameron has changed the look of the film in regards to colours.

In an ideal world, studios, with directors assistance and approval, would scan the camera negative and leave it at that with no tinkering afterwards. 😄

In regards to Cameron's other films, they've all had various use of AI but Titanic and The Abyss come out really well and I believe The Terminator hasn't done too badly either.