I don't see what anyone sees in Win10 that makes them say it's "the best Windows ever" other than paid evangelists from MS. I don't dislike Windows, in fact other than a few minor issues I think Windows 7 is fantastic, it's the pinnacle of Microsoft OS development. Rock solid stable, reasonable compatibility, good performance, beautiful and highly customizable UI, it does pretty much everything right. XP was excellent for its time, at least once you disable the ludicrous Fisher Price default color scheme. Win2k was rock solid, Win98 was reasonably good for the time and Win95 defined the direction of Windows for the next 15 years.
Windows 10 on the other hand feels half baked, it has that same design by committee, full of inconsistencies crufty feel as Linux distros from 10+ years ago. It feels more like a platform to push Microsoft "apps" and services than an operating system existing as the foundation on which I'm to run the software of my choosing. The forced updates means that once enough users are locked in MS can make whatever changes they please and we will have little we can do besides bend over and take it or switch to another platform entirely. In the past if I didn't like a new version of Windows I could choose to remain on an old one. I could upgrade on *my* schedule, and could trust that if I leave my PC up for a week with a bunch of stuff I'm working on open, it will stay that way and not decide to reboot whenever it feels like it to install some new changes I didn't ask for. The forced update thing is something I've always hated about smartphones and now it's coming to PCs which are a tool I rely on daily to do work. This is unacceptable to me.
So what does Win10 offer over previous versions? Sure, it boots a tad faster but compared to a fresh install of Win7 the difference is pretty negligible, and who cares? I boot my PC once in a day at most generally, often once and then run for several weeks. It has the latest security updates, but so does Win7 for a few more years. That's about all I've found, and certainly not enough to make it worth staring at that fugly UI that looks like a preliminary wireframe, or the baked in services and promotions that I do not care about in the least, or that joke of a browser they keep nagging me to try, or the gimmicky Cortana that does little more than open a Bing search for something that's not what I wanted, or the search that by default searches the internet when all I want to look for are files on my local machine, or the ridiculous universal apps when there are far better 3rd party offerings for what any of them do.