Two years ago, I bought a Macbook Air to my wife after she complained that she was not able to make nice photo books with the software available on Linux (Ubuntu). Since then, she considers that Gnome (she does not it is Gnome, for her it is Linux) is way more user friendly than the Mac.

She has been annoyed many times by the way her Mac is running. One day she lost all her books because of a new version if iPhoto which suddenly requires you to have a kind of remote on Apple servers, the spreadsheet/writer tool is really bad at opening Excel and Word documents, the email client has very small fonts, etc...

For basic day-to-day usage, we found that Windows/Gnome/Macos are basically at the same level of consistency/quality. You can complain against some stuff on each side, they have inconsistencies on each side, but at the end of the day, one is not any more really better than the other, but she hates the fact that she has no ideas why sometimes on the Mac it does not work.