The only genuinely "dreadful" thing about Windows 10, for me at least, is the forced updates.
Not only is it really unnerving to let the system basically make any changes it wants via updates, but for my laptop, it eats the battery right up and burns all my cellular data when I tether.
I only have a fairly old laptop that I don't use all that much, but when I need to use it on the go, it doesn't care that I'm tethered or that it's on battery, it will burn through it all no matter what I say. In fact, I can't use that computer anymore as a result.
Not such a big deal on the desktop computer, but seriously, that is very hard to get over. I've always been rather critical of Apple for their update policy with iOS, and this is worse yet.