Let me quantify myself; I hated Windows 8, and I never used 8.1.
Windows 10 strikes me as a much better balance between the familiar desktop mentality (which is my fundamental user experience, being a desktop user) and the need to morph the UI to accommodate a touch-screen-driven device. Win 10 has a Tablet Mode, instead of trying to smush the two interfaces into one, which is an improvement.
Honestly the start menu thing was a big problem for me. I don't like icons on my desktop; generally I'm a <winkey>+typing+return kinda guy to fire off programs in Win 10 (which I'm informed was a Windows 8 feature too) - but I find I need an orderly list of the installed stuff on my machine. The start screen didn't make any sense to me on a desktop box; yes, it's still there if you want it, but you're not
forced into it, and that's all that I care about, really.
For a preview I've been impressed with the stability and performance of the builds, too - I haven't had a blue screen with it yet, and gaming performance with high-end games like GTA V is what I was getting from Windows 7, so I can't complain about that.
All in all, it's a system I could use every day, though I don't use it for work (because I am a linux sysadmin and it's just easier this way).