Beyond storage some of the other "best things" were the easy to navigate UI with the click wheel, instead of the finicky buttons or multiple repeated swipes that other devices required. Also the iTunes integration. Having a solid music app on the desktop, that made it easy to create playlists, which could that automatically sync with the iPod so everything was there without a bunch of work, was a game changer when it launched. I bought my first Mac to get iTunes, because the software on Windows at the time sucked so bad.
