In principle, the feature set that Windows 10 ships could be useful. I don't find it appealing personally, but if it works well for you then that's great.
The issue that I have had is that every version of Windows I have used (from XP up to 10) has had serious reliability and performance problems.
As a specific example, it seems that the one Windows machine that I keep around to play games on needs a complete re-install every 6-12 months, usually because Windows tries to update and bricks itself so badly that even "Windows Recovery" cannot salvage the install. This is a relatively nice machine (Haswell i5, 24GB DDR3), and I tend to stay on the happy path of just running the vanilla install plus Steam and a small number of games (never any programming, web browsing, etc.).
In cases where I've had to use Windows for work, I've found that most of the built in programs lag and take a long amount of time to respond to keyboard or mouse inputs (in the specific cases I'm thinking of, this was on top-of-the line Dell Precision notebooks at the time). Most of my code seemed to run subjectively much slower natively on Windows than it did in a Linux VM running on the same machine.
I'm not trying to be a power user of Windows, as I generally try to avoid using it as much as I can due to the bad experiences I've had in the past. I'm not doing any crazy registry editing or anything like that. Just pretty basic development work and gaming over the years. In that time, I've never had a Windows install where the features reliably worked, and the install remained stable for any period of time.
This is all anecdotal of course. It's possible I've just be incredibly unlucky, or that I've had a string of a half dozen machines that have hardware that's somehow broken in a way that only affects Windows.
So what I'm wondering is: all you people who keep chiming in on these types of posts claiming that Windows works well for your use case -- what are you doing? What's the secret to having it actually function reliably? I've not been able to replicate any such success.