Seriously, what is so wrong with KDE?
During my Linux journey, for the last 10 years, I at first switched between GNOME and KDE, mostly as each one leaped the other in features and desktop fanciness. However, for the last 4 years or so I keep using KDE and I am pretty satisfied. GNOME v2 was not as close as Windows as I'd like, and one of the good parts of KDE is its ease of customization.
Maybe I'm not a typical KDE user. I don't use many of its features: no plasmoids, and half of my default apps for basic tasks are not KDE ones. I use Firefox/Chrome and Thunderbird instead of Konqueror/KMail, althought Konq is great for some tasks. Dolphin, Digikam and Amarok are ok for me, but I use LibreOffice instead of the KOffice suite.
KDE runs ok in a not so powerful machine, integrates well with any other application you have be it Qt or Gtk based, and you can change almost everything you don't like (including the annoying single click for action default that pisses former Windows users like me) And from what I see, you can easily customize KDE and make it as simple in appearance as the LXFCE/XFCE alternatives in a matter of minutes by changing a few things via GUI settings, no command line involved.
The 3.5->4 transition was a bit painful, but the pain only lasted 6 months and was mostly an annoyance.
In summary, KDE is not perfect (neither GNOME v2 was) but together with other FOSS pieces it can be a productive DE and as simple or complex as you want without you investing too much effort on reaching that state.
The other day I was on a friend's house and he showed me his latest Ubuntu install. Both GNOME v3 and Unity are both a radical departure from the last 15 years of DE/GUI, and full of glitches and downright bugs that I was happy not to have to deal with that and switch to something else. I recommended him trying apt-get install kubuntu-desktop and left the house with him playing with KDE.
Thus, KDE seems to be a viable and workable alternative to GNOME/Unity. But for some reason, each time I see a discussion in the web about alternatives for GNOME v3 and Unity refugees, I never see KDE mentioned.
I don't want to start a flame war, but seriously, what's so wrong with KDE?