It's mainly "old school" who dislike Windows 10 (ie people like me who've been computing for decades - starting with the first mainstream version of Windows, and DOS command-line programming before that.).
Technically, Win10 is the most advanced Windows version yet, but the UI is such a break from what I've been used to, that's why I dislike it, plus you can't disable automatic updates any more (not without some skulduggery in the registry).
But if your first introduction to a Windows PC was only a few years ago (post Windows 7), then you're not going to dislike Windows 10 in the same way that I do. Even I will have to use it (or it's successor) one day, but it's not in my household yet.
Wow, I just scrolled up to see the length of this discussion - - - it's certainly generated some interest.