Why not have a healthy Mac debate?
I personally really enjoy using them:
-Older Mac (PowerPC-era, early Intels) hardware is well built, beautifully designed (Sir Ive) and reliable (LC PowerMacs and iMac aside). My PowerBook G4 was built in 2005, has been dropped on a hard floor, and still functions perfectly - not a single hardware failure.
-Professional software selection - most design software will run on OSX (Adobe CS, Unity, Max, Pro Tools etc.). I do find the electronics area to be lacking a little (I'm sure you would too, Comet), though the story is the same with Linux and it's nothing a little bit of Windows VM magic can't fix.
-Stable Unix-based architecture. When I ran Windows I never found it buggy per se, though I've always been quite worried about application crashes (arguably the developer's fault). I've found the Mach kernel to be pretty solid and good at recovering from problems. The FreeBSD userland is very nice too (nothing much to say in the GNU vs BSD userland debate) and means that apart from the tried and tested Unix architecture, most Linux software is available thanks to MacPorts and Homebrew.
-Driver support has been painless with every device I've used being usable straight out of the box (audio interfaces etc.). Windows has made many improvements, but I feel that the more complex hardware still being plug-and-play in OSX is a winner.
-The user interface is, in my eyes, the benchmark that I judge all others by. It's space-saving, logical, and overall very enjoyable to use.
-Insane exclusive software lineup - Final Cut, Logic, Aperture etc.
A few things I don't like:
-Trying to push stupid, expensive, proprietary standards.
-Dumbing down of OSX for iOS generation.
-Price premium for the newer, less reliable units.
-Worrisome security update frequency for Java etc.
-Native gaming experience
