I've been running Win10 since forever on multiple PC's - it's MS's best o/s that I've used.
Of course, if you're a paranoid person who believes that M$ is out to get you and sell all your telemetry data to the darkweb, the CIA and the Russian Mafia, then I would avoid it like plague.
PS: The latest version DOES have a rather irritating 'feature' which allows Microsoft to push 'ads' into File Explorer, but I'm not sure how intrusive it is since I haven't upgraded to that version yet.
But yah, Win10 isn't a nightmare for me - I'm very happy with it.
In a discussion yesterday, I went so far as to say it was the love child of WinXP SP3 and Windows 7 with a new interface.
WinXP became a really good mature product by SP3 while Windows 7 was just all kinds of great. Hated 8 and 8.1
Really digging Win10.