Installed 16.04 last Saturday no large issues but then my scope of customization is really small. Nvidia drivers also installed without an issue which is honestly a first (for me on any distro).
Tried dozens of distributions and spent endless hours trying out desktop themes and other desktop customizations.
Nowadays I just use whatever defaults are there. Probably the only customizations I do are related to power management and what should happen when closing the laptop lid.
Same boat. After ~15 years of nearly daily fighting with computers to do the right thing. Fighting with them to look pretty WHILE doing the right thing just seemed like wasted effort.
Also modern slackware is pretty nice.
I don't like Unity because of the top bar (I move everything to the bottom) so I use Gnome Flashback with Compiz. It works well, almost good as 10.04 and much better than any intermediate release. It's not perfect because of some work still to be done by Gnome on supporting the flashback environment (eg: no File, Edit menu on Nautilus, a menu which I very seldom use). Apparently they're working on that.
Overall I'm happy with the upgrade (I was coming from 12.04 on this laptop).
PubkeyAcceptedKeyTypes=+ssh-dss
Fedora makes this far easier as there is a kernel module (which sits in RPM Fusion) that will download proper driver, install driver, strip nouveau, modify x on boot. But I'm not sure what changed in Fedora23 but I can't make boot-able USB's anymore. It just hangs on an early memory mapping error.