Overall I enjoyed the Arthas-Rise of the Lich king. My criticism of the book is slight but pertinent.
I found the story lacked depth in charcaterisation ( I assume they leave WOW the game to do this for you), but already being very aware of the lore behind WOW, I was expecting this book to back it up a little more than it did. The story tended to jump large periods of time, and not clearly explain Arthas's motivation, nor indeed explain particularly well the obsession that the man became subject to.
This obsession drove him on to carry out increasingly terrible acts, and the reader is left to just accept the fact, and not have it explained that there was a voice in this mans head willing him on . From the point that Arthas laid hands on Frostmourne, the Lich King had control of Arthas, even though he did not initially realise it.
A few examples of how the story "leapt" without explaining itself.
:-Arthas hiring the mercs in Northrend, then blaming them for the wrecking of his fleet to his own men. Little reason for this is given . ( I know the reason, as it is played out in WC3, but someone new to the story may not see it )
:- Arthas returning home and killing his father. Almost no reason or justification given.
Anyway, the book now sits, having been read once ( it likely won't get read again) on my bookshelf. It's probably a better book that I could write, but contains nowhere near the detail and depth I would like to see given to my favourite MMO. Simply an "OK " read.