As stated in the previous review, the setting details made me less enthusiastic about the Cthulhutech game line.
Its treatment of religious beliefs is nonsensical, but not a surprise given the hand-waving that leads to English as the one true language of humanity in this universe. Perhaps the truly hard-core anti-religious Atheists might delight in the treatment of religion in the setting, especially those who delight in the failings of Christianity, but what is in the book is neither true to Lovecraft nor reflective of the history of religion. If Lovecraft's characters lose their faiths, it is because they have derived it through the misery found in life... it shouldn't be something like, "due to the existence of Cthulhu & extraterrestrial life, Christianity becomes invalidated and ceases to exist" (not a real quote from the book, but you get the idea).
The addition of the Migou was also something of a mistake, as said before. The time spent rationalizing their motives & behaviors does not make them more impressive or interesting. If they tried to de-mystify the motives of dread Cthulhu, that might be an even bigger failure, but making the Migou more understandable in the style employed by the authors was pretty wrong IMO.
What could have been done in its place to make Migou playable? It's not up to me. Certainly, playable Migou is an attraction of this book. How it was pulled off was not satisfying to this reader, however. It may please others.
Good parts... more Nazzadi information & background is always helpful. How the Nazzadi got to rule over Cuba & the mystical hand-waving involved... meh. The Nephilim are also interesting. Thus, it wasn't a total waste of time.
I guess I'd want sourcebooks to at least pose new questions if they don't fill in the gaps in a setting. "Vade Mecum" was successful in that, and was a solid sourcebook. In contrast, "Mortal Remains" seemed to demystify the setting in a completely unsatisfying way.
Unless you are running 100% Nazzadi games & want the info incredibly badly, or really can't do without the Nephilim rules or the Migou rules, then I couldn't recommend "Mortal Remains". Perhaps if you failed in your World History classes & find organized religion to be totally reprehensible, you may be intrigued by the setting as described.
"Mortal Remains" is mostly a background/story sourcebook with some additional vehicles & rules. Given that the quality of story & background in the sourcebook is almost enough to turn this reader off of the game line completely & have second thoughts about other books by Catalyst, I think "Mortal Remains" might be in the Complete Disaster category of gaming sourcebooks. I would still give Cthulhutech a shot, but the setting has an uneven quality to it & it really shows in this sourcebook. Get "Vade Mecum" long before you get this one.
Cthulhutech Vade Mecum