I think Windows 7 and Windows 10 still have very clear interfaces (I mean Win32 GUIs, not the Metro/Modern stuff no one outside of MS really cares about).
I've never understood however the need to disable Aero and switch to Windows Classic, which looks gray, boring and feels like using Windows 98 again.
Ironically, most of the people I know who used Windows Classic mode switched to Linux later using something like GNOME or Cinnamon and then complained how ugly Windows was in comparison :)