This paragraph is really the root of what you're saying, and a big part of what the OP said as well. And it's simply wrong.
Yes, Windows 7 was popular, as the OS that "fixed Vista". But there were still plenty of complaints. Many of them the same complaints that have been made here. You can easily find posts on this site complaining that the icons in Windows 7 were a mishmash of Win 3.1, Win95 and XP, with no cohesive design.
Win10 has actually improved things here, a LOT. That said, I agree it's still a mess. But, it always has been, and frankly, IMHO, the other platforms aren't really any better, other than they have fewer decades of legacy cruft.
Modern Apps bondsbw has this one correct. Modern apps are not about mobile at all anymore. One could argue they never were, though there's no denying the extremely heavy focus on mobile with all of Win8. If this is your complaint, however, I don't understand why you're on Win8 or how Win10 couldn't be seen as anything but an improvement here?
Edge this is version 1.0, and as such, is actually a really impressive browser. I'd love to know which sites you visit that are improperly rendered, because I've not seen any yet. Since I doubt you use IE, I don't see how your opinion here matters much, however. If you do use IE and actually think Edge is a step back... I doubt you'll find many that agree.
Start Menu some of your complaints here are valid, but the hate on the tiles colors your post for me. Don't like them, then get rid of them. Problem solved, no? I do agree, however, that this is an area where they still have work to do.
Dual Monitor Support I honestly can't comment here. I use dual monitors all the time, but I have yet to install Win10 on such a system. Some of the things you complain about I find surprising, and assuming you're correct this would be a very legitimate complaint.
Cortana Can't agree with much of what was said. Cortana's voice recognition is far better than any other voice recognition I've used. Far from perfect, but no one's gotten this one down yet. It works often enough to be useful... though I'll be honest I type to Cortana far more often than I speak to her. As for her "just returning Bing searches", well, that's what most people would expect. All of the digital assistants mostly just return a web search. Is the complaint that it uses Bing instead of Google? If so, all I can say is "Duh!"
Automatic Driver Updates like everyone else does? Yes, in the PC world this is a whole lot more difficult, but regular uses expect it and can't really be expected to update them themselves. This is mostly a damned if you do and damned if you don't area. What they could do is allow people to opt out. That complaint I get, and mostly agree with.
Multiple Desktops are not really a new feature. They've only exposed it via the shell for the first time. I see little here that I'd consider to be any different than any other OS has done, so I don't get the negativity.
GUI Uniformit I already covered this. You're not wrong, but it's also nothing new, it's better than it has been, and every other platform has problems here.