Alright, so there a couple of expectations you need to set before you attempt any Warcraft book. First, you need to expect that geography will play a huge part and that your familiarity with Azeroth (and, in certain cases, Draenor) will benefit you hugely. Second, you need to expect a very different sense of experience from the gameplay, especially in World of Warcraft, where the subtleties of warfare and magic are boiled down into easily repeated animations operating on a time-based set of mechanics. Third, and perhaps most importantly, you should expect a decided lack of true climax or resolution because, after all, these books are designed to motivate you to play the games and experience the true drama of this universe for yourself that way.
Approach Cycle of Hatred with all these in mind makes for a good read. Like the other novels from this canon, it operates within a limited timeframe that explores the complex geopolitics on the eastern shores of Kalimdor, where Thrall, the orcish shaman who leads the new Horde, and Jaina Proudmoore, a powerful human mage who heads the human bastion of Theramoore, work together closely to maintain the alliance between their peoples. This alliance is what helped the residents of Azeroth, both native and alien, to overcome the demonic onslaught of the Burning Legion and their attempts to keep it functional are due in large part to the horrors of that war and the war before it which brought the orcs to Azeroth under the demons' power in order to destroy the lives of species such as the humans. With all that backstory floating around--and a lot of it is succinctly but meaningfully laid out early in this book--it might be easy to lose sight of the relatively small skirmishes that constitute most of this novel's action.
What DeCandido brings to the table, however, is a focus on key characters and events that keeps the rising action of this book moving. As the reader uncovers the influence of the Burning Blade, discovers what Jaina finds in what is supposed to be an uninhabited region, and keeps up with Thrall's evolving leadership, he or she feels the tension that grips Azeroth despite its unformed nature. The genuine threats to the world's stability, masked and cloaked as they are, are slowly revealed and dealt with.
But let's be real. This is still a novelization of a video game, and any critical reader will feel the limitations this imposes on the work. While respectable fantasy in its own right, this is not Tolkien or Martin or even Rowling. Like any book designed to market a franchise from across another medium, this one is best appreciated when the reader already has an investment in the lore of the universe it is set in.