This is a much smaller update than going from Windows 7 to Windows 10
It is more like going from Windows 7 to 7 SP1, or Windows 10 to whatever they are calling the Windows 10.1 that came out in August that's still named Windows 10 to confuse people.
People wouldn't have complained so much about it if Microsoft had:
1) given people a way to permanently refuse the install
2) not later decided that closing the dialog box with the 'x' meant ACCEPTING the install
3) not added a bunch of Google like personal information collection
4) not offered strong hints that Windows would eventually become a subscription service, so updating to 10 now might mean having to pay to keep running it down the road
Apple isn't doing any of the things with Sierra that made people hate Windows 10 so much, and there's no hint they will.