While the author was very influential, I'm not sure if the book itself relevant.
Another reason the book is relevant, it clearly shows the power of propaganda and how books can be used to that end.
It's interesting from the perspective of historiography. But it's not relevant in the way the Bible, Quran or the Gita are.
> Other than that, it is a crappy book, the content sucks and the writing is abysmally bad. The latter fact was also something people thought back then, and most people who had the book at home didn't necessarily read it.
This was my point. And in the context of TFA, it's not Lindy.
> clearly shows the power of propaganda
It wasn't an effective instrument for propaganda. The book became popular because of Hitler, not the other way round.
This is of course dwarfed by the number of copies distributed after the Nazis came to power.