To be fair the 90s were a terrible time for comic coloring.
Computers were just getting good and affordable enough for companies to use digital coloring and digital color separation, but most of it sucked. It was a trial period. There were some good computer colorists, but it didn't become widespread until the late 90s/early 2000s. Also the popular digital coloring style of the 90s was airbrushing and it didn't quite work usually.
The 80s still used manual hand coloring, and as a result the coloring was not as detailed, but they felt more solid. The 2000s-current digital coloring just blows everything else away though in terms of detail and effects though.