Apple isn't very good at UX. They just have the manpower to fix things until the CEO stops complaining.
Three things come to mind regarding bad Apple UX:
1. USB ports on the back of a screen
2. No separate Copy/Paste keys, or Undo/Redo keys.
3. Magic mouse with a USB port on the bottom (so you can't use it while charging).
4. Sideways traffic light on top of windows
5. Maximizing windows to full screen is hard to do.