I installed it too.
I liked the start menu pretty much, It's much much better than old start screen.
They also removed metro crap like forced fullscreen and snapped apps and integrated them into desktop like normal programs.
However, there are some bad stuff.
Windows update really loves to install driver updates, and installs them even you tell "Don't update device drivers and pictures from internet" on the setup. I need to install Win10 twice for this. (Crappy AMD switchable graphics thing... Unlike optimus, this thing will make you tear hairs.)
I don't get why there are 2 extra stuff on my taskbar. We already have search thing on start menu, and second one is just alt-tab. With fancy graphics but not practical controls.
I liked the new flattened icon theme, but it's mixed between old and new, looks bad.
Still no
window color and appearance... I miss it so much.