KDE is pretty damned easy to use and consistent too, it's just that not all applications are written in QT, just as not all Gnome apps are written in GTK. So, you get some apps that don't fall in line with the look and feel of the rest of the OS.
apt-get install gtk2-engines-gtk-qt
(Makes your GTK 2 apps look like Qt ones)
KDE is pretty damned easy to use and consistent too, it's just that not all applications are written in QT, just as not all Gnome apps are written in GTK. So, you get some apps that don't fall in line with the look and feel of the rest of the OS.
apt-get install gtk2-engines-gtk-qt
(Makes your GTK 2 apps look like Qt ones)