I wouldn't say mediocre, it's...
-Relatively secure
-Game changing integration with my other Apple products (NOBODY else does this)
-Stays out of my way for the most part
-Runs important commercial software like Office365 natively
-UNIX shell right out of the box
-Homebrew is a decent package manager and easy to install
-Emacs key binds for text entry fields across the entire OS
-It's a little thing, but the animations and sounds make it kind of fun to use
It's a bit inflexible, and the UNIX layer could use some love and modernization, I'll give you that, but once you learn to work within the paradigm, I think it's actually a really good OS.
Oh, and you definitely need to install something like Rectangle to get window snapping, I can't go without that after using it on Windows and Linux, but that's easy enough to fix.