Oh come on, just because something is free it doesn't make it above valid criticism, especially Windows.
I'd happily pay for something better than Windows 10 in its current form :S
Contrary to the perception some might get from my posts I want to like 10 - the kernel generally is good, stability, threading and low level performance are mostly an improvement on previous OSes with some teething issues but nothing out of the ordinary compared to past releases. On paper the concept of the OS would be a massive improvement on what we've had before if it was properly executed.
I just have way too many issues with the shell layer of the OS which at best doesn't seem to know what it wants to be - any time they start unifying the different elements of the UI towards one common approach they suddenly decide to change direction and it all gets mixed up again for example you can right click to get a menu in different parts of the OS and get atleast 3 completely different style menus with completely different colour schemes, visual theme i.e. the menu borders and how the functionality of the menu works.