The documentation blew me away, nicely packaged with XCode, and made it really look like a platform that would care about developers, especially given how niche it was.
That was 10.6 time.
Currently, I have a Mac forced on me by company. I look at docs... and they are the same docs I remember, with bits missing, a "deprecated banner" from 5 years ago. Deprecation notices give no information what APIs one should use in place, or where new documentation is.