Reading various articles over the years I think the "Vista was never widely loved" view is quite commonly held. It might have something to do with Vista being the first alternative to XP, which was clearly once very popular and was itself not much more than an updating of the popular (amongst tech people) Windows NT.
Vista was the start of what many people felt was a change of direction which wasn't necessarily what all customers wanted. Maybe that reached a peak with Windows 8 as I have a feeling even Microsoft recognised there were issues and were suggesting Windows 10 would go some way to providing a remedy. The disappearance of the 'Start' button being one of many grumbles!
One of the tensions has been the difference between users who just want to switch the box on and not have to do anything else, and the users who want a computer that does what they tell it to do. Things like Windows 10's update policy which was "I'm going to sit here doing an update for the next hour and there is nothing you can do about it" wouldn't be tolerated in other technology spheres - for example imagine if you got in your car to go to work in the morning and it told you it wasn't going to start until it had downloaded and installed an update
(by the way, that is coming, and sooner than you might think!) In other respects, Windows 10 is great!
One thing with the upgrades though - it is important to check not just your PC/Laptop will work with Win 10, but also other hardware such as printers and scanners. HP are updating their support website next month, so I've spent some time today making sure I have all the drivers I need for my 'legacy' printers and scanners as I'm not sure they will be available on the new site. As I went through the different devices I was alarmed at how many of them are 'not supported under Windows [7,8,10]' - i.e. you are the owner of a piece of electrical junk if you want a more modern (i.e. supported) version of Windows. I'm not suggesting HP are unique in this either.