Problem is they're constantly redoing everything so it never get the time to mature.
Ten years ago in SuSE I could install my 3rd party TrueType fonts by clicking on the file and follow the KDE font viewers directions. Yesterday on Ubuntu I had to google how and use the command line for installing my extra (no, not the Microsoft) fonts.
I installed Cryptkeeper from the Ubuntu repository but Ubuntu doesn't allow the GUI to show up in the panel (according to a Google search, when it didn't work).
Three times today, while working in Gimp, I got a "Compiz has crashed, wanna send report?" message.
I'm not complaining, I know how to deal with all this. I guess what I'm saying is that the currently "best known" Desktop distribution is just not a mature GUI environment.