I find man pages to usually be concise, to the point, and extremely helpful. I hate it when I find there is no man page for a program for which I have a question.
I remember when we got our first Unix Sytem 3 v7 system in the '80s. The entire sum of the documentation consisted of one binder of man pages, and one binder of troff-formatted documentation on things like flex, yacc, troff, etc. And it was sufficient for an intelligent neophyte (yours truly), but it certainly wouldn't be suitable for Grandma or my accountant.