The new color timing of Aliens doesn't bother me, honestly. I never saw a print of the movie and the leaps in picture quality more than make up for any problems I may or may not have with the color. It like the new look, even if it might not have looked that way in '86. At least I know for sure that Cameron wanted it looking this way for the blu-ray. We're still here several years later debating whether the color-timing (and lack of contrast) on the extended blu-ray of Fellowship of the Ring was actually what Peter Jackson intended.
What does annoy me is Cameron digitally erasing things like Lance Henriksen's visible torso in the final scene, or getting rid of the visible marks on the window from earlier takes when Ripley tries to break it with a chair. It's especially disappointing after his remarks on the SE of Star Wars. Apparently he draws the line at "cgi dinosaurs" as a revision of history, but erasing things that were already there is a-okay?
But even things like that don't pull me out of the movie. You'd have to know the film pretty damn well to notice it, something that cannot be said about the very obvious updates made to Star Wars.
Speaking of Raiders, was the erasure of the snake pit reflection Spielberg's idea or was it Lucas'?