Pffffff...I'll go with what many have already said: "windows 10 isn't bad, but..."
In my case, the 'but' is mostly 'it doesn't add much'. At work we have a roughly even spread of windows 7 and 10. I have users who've had their computer for months and couldn't tell the difference, and I can't blame them: once classicshell is installed with a windows 7 logo, it becomes pretty hard to tell the difference (when not putting them in direct comparison, obviously). 10 isn't more stable than 7. It's not noticeably faster(1). I
guess it's more secure, but the interface is clearly worse(2).
I went linux (mint) at home some months ago, and it's only by doing those day-to-day things that the difference really notices. Those strange slowdowns in chrome? Never had anything like that in mint. These random "this program has encountered an error and needs to close" messages? I only see that at work now. The "please restart your computer to continue" you sometimes see? I think I had it once when installing a proprietary video driver...otherwise, I never had any interruptions whatsoever.
Mind you: these are all small and occasional things. I give it about 9 out of 10 chances that I can turn on my windows PC (either at home or at work) and do daily tasks without any of this described stuff happening. On (a user-friendly distro of) linux, that's more like 99 out of 100 times.
As far as I'm concerned, the largest bugbear is an invisible one. Just what and how is microsoft really taking from your computer? Are they trying to steal your credit card (not likely), or do they want to see which sites you visit so they can use this data for targeted commercials (likely)? I only started using windows 10 when I heard about a program that shut all that off (donotspy), and seriously started thinking of switching when I noticed that updates forced this stuff back on.
Oh, right...and the default start screen. These stupid tiles are butt-ugly, distracting and unneeded. The whole "it's better than windows 8's start screen!" is technically correct but misses the point that it is still a long and totally unneeded step down from windows 7. The "you can install classicshell" is also correct (which I'm not only doing, but am doing FOR ALL PC'S IN MY COMPANY) but is akin to saying "you CAN remove the bed of nails from the driver's seat of our new car model if you insist on being old fashioned".
(1): granted: this is one that's REALLY hard to guess for the obvious reason: newer and faster pc's come with windows 10. I'm fairly sure most if not all the extra speed comes from the hardware rather than the software (let alone the OS).
(2): I have to note I'm a PC technician/administrator that often has to snoop around the options. The "average user" who only accidentally finds out how to change the background picture hasn't noticed a difference. See also: those users I mentioned earlier.
Windows 10 isn't bad by any means.
It's still light-years better than macOS and (sorry) Linux.
Sorry, but at this point the only thing windows is still ahead of linux is program compatibility. I know this is a pretty large factor, but that gets gradually better (that is to say: faster than new software gets released), and when taking other factors also into account, windows certainly isn't "light years" ahead.