To me it seems like a Windows 7 / Windows 8 hybrid operating system. I use Windows Media Center to record and watch digital television shows and movies as well as Netflix, listen to music, and view photos on my network. Very sad to learn that it has been discontinued in Win10, since I have an established investment in it. There is a similar program that was formerly called XBMC which may be able to perform the same functions.
A couple of things I know so far about Win10:
1. Microsoft has made it difficult to disable Windows Update.
2. If you upgrade, your previous Windows key may become invalid, as you'll receive a new key. This may only affect retail copies, I think...
Let me know if you have any further questions. If not, I'll ask that the thread be marked as solved.