Luckily AmigaOS is now in a much better situation that it was 15 year ago: reworked to run on newer hardware, native USB support, large hard drives support, new and faster memory handling, support for easier ports of software from Linux, improved GUI etc. It still lacks in certain areas though, like printing, virtual memory, Java support etc.
What I find in AmigaOS unmatched in other OSes is its ease of use: system files are easily recognizable, the OS doesn't hide its elements to the user like in Windows, yet they aren't as cryptic and messy as in Linux.
Varthall