Windows has done good job with its wonderful Interface; it is graphically wonderful.
Cortana is one intelligent voice recognition system. I have the Windows 10 installed in my laptop with 4 GB RAM and an AMD E1 processor.
The problems I face are various. The boot time is quite high. Browsers work slow. I have got Blue Screen Errors several times past 2 years. When I tried calling Microsoft Customer Support, they could fix this issue for a month or so. Eventually I started getting the same "Stop Code" Blue Screen Errors. Windows 10 might be great for high end computers with 8 GB RAM or more, but not for systems with 4 GB RAM or lesser.