I have read that book twice, though a translated version. It is very interesting, though in the end one can truly see how cruel history can be...if Shu had prevailed, the world MAY be a different place, for better or for worse. However, the Jin Dynasty did play an important role in Chinese History.
I was shocked to see how many fictional elements were added to the Koei games after I read the book (I read it after I began playing the Dynasty Warriors series). But what can you do.