Every decade seems to have its own definition of a “good” mix. The 80s was famous for its overuse of reverb. The 90s, especially 90s rock, had its own sound too. I’m guessing the 2000s will be known for its over-compressed music. From rap to metal, no one has escaped this loudness war. I don’t think the 2010 decade will have a defined sound since home studios are becoming standard. The more audio engineers, the more diverse mixes there will be.