Speed, easy to use, just works. I really like the speed of the Amiga GUI and how it works. The closest to its speed are BeOS, QNX, and maybe MacOS X. Windows XP isn't quite as fast, but XP is faster than Linux on my Athlon 1900. IMO Linux is more bloated than XP, but that's for another forum. Amiga has a fast, smooth GUI. Amiga is simple enough for the technically challenged yet powerful enough for many power users. I'm getting to the point in dealing with computers (been with it since the Atari 2600/Intellivision) that I want something that is quick, is responsive, is simple to use, and is powerful enough to do whatever I want. Some Amiga programs may cause software failures, but at least a reboot is only 6 seconds compared to 30 seconds with XP, 60+ seconds on Linux. BeOS, which I use mostly for Internet and Email because my A1200 is not yet connected to my LAN, boots in about 7 seconds. The days when computers take more than 10 seconds to boot are over; this is the 21st century. In my technical support experience, Companies lose more money on employees having to wait long periods of time for their systems to reboot after a system crash than (no offense) workers who take many smoke breaks. My $0.02.
And one more thing. Amiga isn't dead nor is it rising from the grave. The Amiga was on temporary leave of absence. :-)