Originally Posted by TheCyberDruid
I really like the idea of icons only for the 'important' files for the user and that you can 'thin' the OS to your needs pretty much as you like it
And I'll add to that I like icons of different sizes, and that the normal state and clicked that can be totally different icon. That can look quite neat, even with only 4 colors.
It has some nice and advanced features, especially for 80ies, already mentioned by ppill and others. But it's obsolete today and I can't see any reason to compare it with modern OS.