get real ... it works great
Not being a MS fanboi myself, i think they deserve utter respect. A few days ago i finally gave in, and allowed the upgrade from 8.1 to 10. It went like a dream in less than 1.5 hour. Everything works, it feels faster and more fluent than 8.1. They only subtly made ClassicShell disappear into Avalon, all the other apps, including Fullscreen games, work as they did before.
NVIDIA drivers work, also MSI tooling like afterburner and Dragon gaming center work fine.
The 10 UI is a good compromise between Win7 and Win 8.1 UI, and it looks and feels just great.
So if your machine can, it is advisable to bite the bullet and invest the time for an upgrade, just backup your important files first for ease of mind.