I'd have to say that beyond some minor cosmetic fixes to Aqua (and more for my selfish theming needs/wants than any visual inconsistencies in the system running Aqua as Apple intended), I have fewer complaints about OSX than I ever did about OS9. I honestly think for the most part that people are just adverse to change when they complain about the differences between OS9 and OSX. After working in OSX for almost 2 years I'd never go back and find it improved in almost every way over OS9.