The more I look at the changes to macOS in Sierra, the more I think they are improvements I will actually use and which will very much improve the experience on my Macs. I'm a little surprised at the negativity in this forum, especially considering that these upgrades are all FREE..
The issue is that after upgrading things that worked from day one suddenly break and you then wait a year for the .5 or .6 update that (hopefully) fixes it. The fact that it's 'free' is of little consequence.