I tend to really enjoy the Warcraft books. The game world, by design, has to be rather static, to enable everyone to experience the same content. The books are nice because you get to see the story of WoW actually moving forward.
This particular book dealt mainly with the Night Elves, and an Orcish incursion into Ashenvale. After watching Thrall lead the Horde for so long with a message of peace and tolerance, it is kind of hard to get used to Garrosh Hellscream's much more militant approuch. To be honest, I wasn't a big fan of how he and the Horde were portrayed in this book.
Other plot lines include the Worgen lobbying for entrance into the Alliance, and murders of Highborne in Darnassus. The book also brings back some great characters, like Maiev and Jarod Shadowsong. Varion Wrynn also finally calms down and becomes a more likeable character.