I'll only upgrade if I can make it look and work like my 8.1.
Which you upgraded because you could make it feel and look like Windows 7. :|
Windows 2000. Brought NTFS file system, and NT kernel. Good? Yes.
Windows XP was a tweaked version of Windows 2000 and had many improvements. I'd say is second to Windows 7 for the masses. Good? Yes.
Windows Vista. 64 bit computing, optimized for multi core processors. I think it's way better than XP. Good? Yes.
Windows 7. SSD ready and the best taskbar you can find. It can handle anything there is on the web today (apart from the newest DirectX if I am not mistaken). Good? Yes.
Windows 8. Touch screen ready. Refined to run on lower hardware requirements. Good? Yes.
I do not see a lot similarities between Vista and 7. I see similarities between 2K and XP, and 7 and 8.
Vista was problematic in the beginning and was fixed. 8 had no start button which is easily fixed by a third party program.
How the people are going to react to 10 I do not know. We will find out by the end of the year.