As for the book itself, I have no idea if i liked it or not because it was kind of hard to follow. Also, after the "evil" monitors stated that they were vampire gods I just couldn't take them seriously after that. I honestly wished they just focused on darksieds invasion and death because it kind of lost its significance against the whole monitor arc.
Thirdly, why does batman go shirtless when ever he's away from civilization? What if its cold outside? Does he just feel that his cowl is a natural part of his shirt and he can't remove one without the other?