I loved its graphics and I really liked its great compatibility with very old hardware. The only problem about was essentially its kernel: it wasn't really a multitasking kernel, it just looked like it was but it wasn't, as the normal thing that happened was being forced to manually shut off the computer as the OS was being locked by one single app.

It actually looks like certain today mobiles...

I really liked OS 9. It had desktop sounds that made the desktop experience more fulfilling, as opposed to the current silent desktop of OSX. It also has a lot of features that were useful, but not integrated into OSX, such as the sticky drawers, to minimize folders by dragging them to the bottom of the screen.