"Good" is ultimately a subjective thing, after all - hence you have in this thread the majority of people mentioning their personal favorite authors. I also think "50 Shades" is hot garbage but that's just my subjective take on it - I can't empirically say E.L. James is a terrible author because she's not, her novels are extremely popular with high sales and a ton of fans: how else exactly do you define success for any given author? Same with Christie Golden, really; she's not my favorite author but she's been successful, she's a popular author with many laurels to her name, and she's got a preexisting relationship with Blizzard.
Attempts of have been made of late to try to shore up the Warcraft universe's canon and finally give it a more or less consistent time with the "Chronicle" series. Golden and her peers are another attempt to try to whip the story into shape to make it a centerpiece of the game going forward.