Amiga OS (a.k.a. Amiga Workbench) really does kick Windows/Linux/MacOS's ass. Amiga OS is blindingly quick on very limited hardware, where as Windows is sh!t slow on decent hardware (depends on version). Linux is far too complex for most home users (although I'm a dab hand at Linux - I work in IT so I should be) and Mac OS is just a customised Linux made specifically for Apple's funky looking machines.
Long live AmigaOS - I find AmigaOS's capabilities fine for my day to day activities.