Great, a flame war!
The funny thing is, that I regard OS X as a step backwards in Mac interface usability, and I actually consider Windows to be more intuitive overall.
The worst thing IMO is the jack of all trades, master of none Dock, an application launcher that doubles as a program switcher, task bar, trashcan and whatever else. Or how Apple ruined the "apple" menu. Next are drawers, that slide out of the display area when you have your program window maximized to match the display size. Or windows that suddenly slide into the viewable area. There are way too many moving targets in this interface.
It sucks that you can't move a file, only copy (and go back to clean up the original file after the fact - edit: this refers to moving between different drives or cut/paste via context menu
). Column view in the finder is a completely weird idea, and the entire finder is a sorry excuse of a file manager. There are tons of decent file managers on Windows, and not a single one for Macs (Pathfinder follows the finder too closely for my taste). It's annoying that I can't reach some buttons and many menu elements with the keyboard and am forced to use the mouse. And yes, it's completely counter-intuitive that hitting the return key on a selected file doesn't open the file, but goes into rename mode, which is much less useful.
I even hate the oversized trackpad of my iBook, because I keep tapping it inadvertedly. And their once-legendary reliability has gone overboard (my iBook is a prime example for that).
I could go on for a while, so there are
a lot of valid negatives about Macs.
But there are also some applications that provide elegant solutions for real productivity problems where I can't see equivalents on Windows. Like Tinderbox, Omni Outliner, DevonThink, Packrat, Mellel, Scrivener and others. Merlin, maybe.
And I enjoy not needing any anti-virus, anti-spyware and anti-WTF for my Mac.
Plus, I don't need to "activate" my OS (wait, it came with a hardware dongle called "Mac", so this point is moot).
No, I'm not into a pissing contest. And I wish Apple had bought Be way back then and put their classic GUI on it instead of buying NeXT and rebranding their OS "Mac OS X".