I’m sure this will be 100 posts from people that will swear that half of those people uninstalled it, or that Microsoft is fudging the numbers, or how someone “tossed my PC and got a Mac” or Linux or whatever.
Oh dont forget the 10000 variations on the “I was forced” meme.
It's not -quite- that bad. :-)
As for myself...
I've been running 10 in a couple VMs for a few months and it's mostly fine. I've had a couple of application problems, and my Linux/Samba-based file shares stopped working because Win10 dropped back-compatibility and only supports a new variant protocol of SMB that wasn't part of Samba when I built the fileserver, so that's on the list to get upgraded.
Overall it performs well. I'm not a fan of the remaining bits of Metro that lurk in the corners of my desktop but I'm studiously overlooking them.
On the other hand, my working machines are 7 and may very have to stay 7 for a good while, because I have to get work done at work and can't be compromising productivity for newness.
On my personal machines they'll probably have to pull 7 out of my hands in 2020 by stopping the security updates. OTOH, I'm looking at buying a SurfaceBook when my current laptop (a wonderful, reliable, speedy Fujitsu) quits at last, and of course the SB will come with Win10. I'm probably gonna try running 7 Pro on it, but by then, if I have to run 10 I'll probably have figured how to make things work with it acceptably.
See? Not so bad.
I can only speak from my experience with it. I tried and I didn’t like it.