Unpopular opinion: I like Unity. have tried KDE3, Gnome2, Gnome3, XFCE, even FVWM and a couple of oddball window managers, and overall Unity is ok. Reasonably simple, stays out of the way. I think in the long run it's an improvement over the systems used by the "we've always done like that" crowd, and it has helped a lot bringing Linux on the desktop of the average user.
I also like systemd.