Sigh. This is what comes of having friends with opinions.

Since posting the below, another friend has come forth to say the opposite: be proud of your book's origins. "Own it," he said, among other exhortations. I've spent some more time considering -- additionally noting that your review mentions the book's origins in part to establish your possible biases, which is a degree of honor I quite admire -- and I'm amending my opinion below, to instead be this:
"If you have read the book and want to leave a review, write whatever you are moved to write." And, upon reflection, I should just shut up about this and be glad that anyone is willing to invest the time and energy not only to read the book, but offer an opinion on it. The book isn't in my hands anymore. It's in yours.
I'll leave what I wrote below, lest anyone think I'm trying to rewrite my own history, but feel free to ignore it. Thank you all again for your decade-plus of support. I should stop meddling and just be grateful.
-D
Hm.
SolitonMan, this is a difficult post to write, because I don’t want to seem ungrateful. Nothing could be farther from the truth, I assure you. Your review was generous, flattering – in general, everything an author hopes to hear about his work.
But…
Since you posted your review, three different friends of mine have come to me, separately, with the same general observation – that there is a large segment of my potential audience who will be severely turned off by the notion that my books are based on a D&D campaign. That there is a widespread perception that such works are – the Forgotten Realms books notwithstanding – a red flag for amateurism in the wider world of fantasy fiction. And though your review is glowing, it does spend its first half announcing to the world that TVC is derived from the gaming table.
One of the three aforementioned observers also said that as the body of the review makes comparisons with the game itself, it makes it sound as though a reader *not* familiar with the Story Hour might have a different and more impoverished reading experience. I personally wouldn’t go that far, but I can understand the concern.
I’m not going to ask you to edit your review – that would be a step too far I think, a step that no author should take towards any reviewer. I will leave that to your own judgement, in light of the above. But if I am allowed any gentle nudge of my EN World readers in general, who may someday leave a review on Amazon, it’s that you treat the book as its own entity, and judge it entirely on its own merits – even if that would diminish the book itself in your estimation.
Thanks much,
-Dorian