Well it was to be expected that this novel wouldn't be really good, because of its theme alone, but people are way too harsh with this little excerpt.
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Almost all of Garrosh's entire characterization comes from golden and to a lesser extent knaak, so she can't really misinterpret it, she fleshed him out the most and his behaviour is well within his character.
The only thing that is actually out of character is his little scene in Stonetalon.