I clean installed macOS Sierra on my 2013 Macbook Air this week it seems just fine to me. So far, I only have a couple of issues with it:

1) more bloat (but almost every OS has this problem).

2) cuts off support for some older Macs for no good reason.

One thing I really like the new default terminal font: San Francisco Mono. I don't know if that font is new to the OS entirely but I really like it.

I also really like that you can have the Finder sort folders before files. This should have been added a long time ago, but better late than never.