Windows 10 is faster and smoother than any other windows operating system. It has many improvements over windows 8 and 7 including DirectX12 for improved CPU utilization in gaming scenarios, power-user improvements like the vastly improved command prompt control, security improvements, and more fluent search being only a few of the long list of improvements. Although Windows 10 is better than 7 or 8 in many ways, it has its downsides. Some of which include bloatware and automatically installing junkware, advertisements with PAID licenses, dumbified UI, random forced updates, and microsoft's telemetry. The biggest problem of these being the telemetry.
Microsoft collects all your personal data all the time and they even state this in the user agreement. "We will access, disclose and preserve personal data, including your content (such as the content of your emails, other private communications or files in private folders), when we have a good faith belief that doing so is necessary to". Even though they collect all of your personal data, there are ways to disable this. To disable Microsoft's spying, we download get some freeware called "Destroy Windows 10 Spying". http://www.majorgeeks.com/files/details/destroy_windows_10_spying.html
After downloading, go into settings and enable whatever you want to disable. You can then go back to main and press "Destroy windows 10 spying"