I decided to take Ubuntu 15.04 out for a ride a few months ago. I haven't really used Ubuntu since 7.something (but I liked 4.10 a lot), but I did occasionally work with it (e.g. helping out colleagues who used it).
I desperately tried to like Unity, but nope: its development seems to be done pretty much the same way that Gnome development is done. A lot of effort goes into creating a distinct experience. Very little seems to go towards listening to users, and options are basically non-existant.
Changing the GTK theme, for instance, is no longer easy (you need unity-tweak-tool). Changing the buttons on the titlebar is outright impossible because now they're hardcoded.
This is... very much against the spirit of people who were involved in the open source movement a while ago. A lot of us switched to Linux because we wanted more control over our systems.
Free software that locks down your options is... missing the point a little.