How about the compatibility ? is it good ?
All game run without prob ?
Compatibility is pretty good but worse than it was in Windows 7/8.
One of my favourite games of all time and still our favourite racing game in LAN parties, Rally Trophy, doesn't work in WIndows 10 at all. It's a huge loss for us but what can you do...
Also Windows 10 does a lot of things automatically and doesn't really care if it breaks something driver related. It will stubbornly do its thing and re-install old/new shitty drivers on devices that won't work with those drivers. When you finally get everything up and running, it decides to install a bigger update that resets your drivers again. I've had a lot more issues with Windows 10 than I ever had with 8/8.1, and I really didn't like 8/8.1 either. Multiple devices with driver issues. Never had so many driver issues before.
Then there's the license issues. They are offering you free Windows 10 now but that offer expires next summer. What happens when your motherboard breaks after that and you need to re-activate but the activation is tied to your hardware? You don't have a cd-key with the "free" Windows 10 upgrade so... well to be honest, I haven't kept up-to-date with this license stuff. Are we any wiser now than we were at Windows 10 release?
Basically it's yet another Windows. Some things will always break, nothing you can do about that. They are definitely going more and more towards the Apple way of things though, remove options and settings and try to do everything automatically. Nothing should ever go wrong and if it does, well, you can't do anything about it.