We used Ubuntu for years to teach people how to use a computer for the first time: we gave them old PC's with Ubuntu installed. Unity made this impossible. It was too slow for the old machines, too hard to figure out for the new users, and too unfriendly for experienced users to tolerate.
Hate hate hate hate Unity. Always will. Went to Mint because of it. Even installing another windowing system was a huge pain in the ass, because first, you had to install Unity and go to Synaptic and install an old Gnome. This took HOURS because Unity was so freaking SLOW!
I dunno, maybe you fixed these things, but Unity ended my relationship with Ubuntu after years of advocating for it to everyone I knew.