Not the best book I’ve read that’s for sure. Perhaps it’s because other than the games there is little background literature to draw inspiration from. It’s not like there is a whole “universe” of depth and mythology surrounding Diablo like there is with the various D&D games. The story isn’t that great because it’s drawn from a game that has little story itself. One could argue that fact of course, but few games without a book world to draw from are as detailed as they could be otherwise.
The author Richard Knaak, did a good job with what he had to work with. It was just a bit generic is all. The kind of generic where you don’t really get to learn all that much from the characters, or even the various factions and histories either. Like if they took what could have been a grand trilogy and condensed it into a few hundred pages by sacrificing details.
I’m hoping now that the first one is out of the way, its sequels will build upon the first and get better as they progress. A hardcore Diablo player may find some entertainment here, otherwise most sword & sorcery fans can pass on this one.