I feel that Windows 10 has an improved file explorer and file copying dialogs over Windows 7. In every other way I feel that I still prefer Windows 7 -- system stability, lack of apparent bugs, much more coherent settings functionality, lack of resource-consuming microsoft spyware (cortana), better built-in themes, messages from system are less annoying/"cutesy", ability to fully control updates, lighter and better built-in apps.

I think 7 still remains the peak of Windows and I agree with you that Windows 10 presents a lot of motivation to stick with OSS :)