This story of a meek librarian who gets transported into a parallel universe dominated by swords and sorcery is, as the name suggests, a parody of the stories of "Conan the Barbarian".
If you find the title funny, you will probably find this book mildly amusing - probably not quite as entertaining as you may have hoped from the title, but the book does have its moments.
It wouldn't be entirely fair to dismiss this as a one-joke comedy. Nevertheless, if you don't think the title is particularly funny, or have never heard of "Conan the Barbarian," then most of the jokes in the book will probably go straight past you.
There is a sequel, "Krap the Conqueror."