This is true for me too as long as I don't use OpenBSD. The cause is that GNU/Linux manpages are horrible. They are mostly outdated and not in sync with the versions that are actually installed.

As soon as you log in to your newly installed OpenBSD system, your root account has a mail in her mailbox stating to read the "afterboot" manpage. When I first time entered "man afterboot" in my shell, I was blown away.

http://www.openbsd.org/cgi-bin/man.cgi?query=afterboot

  The idea is to create a list of items that can be checked
  off so that you have a warm fuzzy feeling that something
  obvious has not been missed.

It gives you a fast introduction with all informations you need and then references all locations where you find every other topic. At that point, you don't need google anymore where you again find outdated and incorrect informations.

The documentation is so high quality that this is the biggest advantage I appreciate the most.