Not really sure what to think about this manga series. I like it okay, but I don't love it. I think the artwork is lovely, but the monsters are gross. I like the characters, but I don't especially care about them. I thought the plot was interesting, but now I'm not sure if I even remember most of it. It's a middle of the road manga. I enjoyed reading it, but I probably wouldn't read it again.
I have never read the Infernal Devices novels, so I'm sure that the novels must be better, with more depth and scope for the plot and characters.