"Meh"
What started as an excellent introduction to the realm of Eberron, quickly runs away and becomes so over the top that the story lost me.
Combine that with a change in Narrator led me to abandon this book. Not that Brett Barry did a poor job once he got his bearings. This has a lot to do with the amazing job Alex Hyde-White did with the voices of the Warforged, and with the last book ending up in the middle of a conflict with the Warforged the "reader" is severely disoriented with the change.
In the beginning of the book it was almost like listening to TTS rather than a narrator, though he adjusts a few chapters in the story is so grandiose in comparison to the first book that I lost interest.
"Setting the Stage for the World of Eberron"
The Dreaming Dark series gives the reader a great start into understanding the feel of the Eberron Campaign Setting for Dungeons & Dragons.
The Series has a pretty linear progression
The City of Towers takes place in the City of Sharn, introducing the reader to the Warforged, the Dragonmarked Houses.
The Shattered Land takes the reader to Xend’rik, and uncovers a glimpse into the world of the Eberron Drow.
The Gates of Night takes this adventure to the Planes and sheds some light on the driving forces of this universe.
Personally I loved the first book, the City of Sharn is so full of adventure it almost shames all other campaigns I have read about, and I suppose that is why my interest in the series waned as the story moved from this city to uncover the setting as a whole. The adventure gets to be a bit "over the top" especially as it runs into the final book of the series.
The change in narrator for the 3rd book didn't help with this... at all.