I read it mainly for the characters, the worldbuilding and the action packed battles. The art doesn't need any mention because this is the author of SE we're talking about, his art has always been outstanding.
The plot is still shaping into something, but the premise is quite promising. And the setting is easily one of the darkest I've read in a while.
! The fact at some point Shinra will have to put his mom out of her misery, is a pretty fucked up thing.