The problem with man pages is that they are designed
to be
reference material, rather than
tutorials, and
they are typically very good quick references and horrible
tutorials. (There are exceptions, of course.)
Frequently, man pages assume you already know what you are
looking for, and just need the details.
As a result of this, if you are trying to learn a new
concept from man pages, you may find yourself following
circular references and reading a loop of pages several
times to grok it all.
texinfo, on the other hand, was designed to present
both a tutorial and a reference guide. Usually, texinfo
collections are good tutorials, but their quality as
reference material is only as good as the cross references,
index, and table of contents put in them.