What I find annoying is the number of command line programs that don't even have man pages anymore. Or maybe that's just an artifact of installing them with brew?
What I find interesting is that for the most part (there are exceptions), the older the man page, the more useful it is. Realistic examples. Succinct descriptions. User-friendly terminology. Too many of the newer man pages seem inflated and full of jargon to make themselves seem important or worthy.