I chose this book, because I thought the fact I'm playing Baldur's Gate III right now will make me accept the various absurds of a DnD novel more. On some level this approach worked. The book wasn't terrible. A character or two even had a personality and it did provide a nice example of a rogue and paladin setting aside their differences for the common good.
The combat was a mixed bag. On one hand it did good job of staying faithful to the rules and mechanics of the game, including various class abilities, without calling them by their names and instead describing them in a way that would be understandable even to someone not familiar with the setting. On the other hand you could see the round-by-round combat and rolls being done in the background, aliong with the typical absurdity of being stabbed in the heart multiple times and these being just "flesh wounds".
The biggest problem, however, was the plot. While I do believe that it is possible to make a good plot set in Forgotten Realms or another DnD universe, describing a dungeon crawl is not the best approach. And adding pointless backtracking, fetch sidequests, looking for keyes, characters that appear just to be killed off, completely underdeveloped villains (seriously, how do you waste a dracolich?!), pointless lies... yeah, the story just isn't that great, even if one doesn't look at the usual RPG shennanigans.
Pity.