One of the issues with W10 is the title bar colour, or rather the lack of it. Furthermore, you can no longer differentiate between the active and inactive windows. The code is apparently still there in W10 but inactive. You can turn it on with a theme you can download from here:
http://www.nextofwindows.com/how-to-change-title-bar-color-in-windows-10
On my PC the title bar is now the same colour as the taskbar. Also, the close window X box is coloured red for the active window. A small change, but it makes a huge difference to the look and style. Hopefully MS will fix this soon.