ETA: I got around reading the mortal instruments and consequently am docking a star from the infernal devices. Writing the same trilogy THREE times? Not cool.
I was not impressed with Clockwork Angel, so I had no intention two read the sequels. But it's been a rainy summer so far and because summer = silly YA romance fluff and the rain has kept me indoors a lot, I was running out of other things to read. To my surprise, I did not hate Clockwork Prince & Princess and happily admit that, for all their faults, they are entertaining and highly addictive.
It is bizarre how Clare seems to be able to design a broad framework, a plot and a world for her story, but all the individual elements within it seem somehow borowed. I know all authors are influenced by their surroundings and borrow material here and there, but these books read more like jigsaw puzzles than literature: Here a chapter from Buffy the Vampire Slayer, then a bit of dialogue from Supernatural, followed by some visuals from Stargate. What seems to come naturally to Clare is humorous dialogue and snappy one-liners, and where the books are in their best is in playful character interactions. However, when its time to give all the heart, or to go outside of her comfort zone, Clare starts holding back and relies on other people's vision, embellishing tried and tested tropes with some rather unfortunate prose. I feel that more courage from the writer, more trust in her unique voice and ability to bring the books to life, would improve her writing immensely.
Being 'addictive' seems to be a rather recent qualifier for a book, or at least I don't remember that being used to explain the success or the value of a book a decade or two ago. What makes a book addictive, though? Often it seems to be an explanation for why someone is reading a book they think is bad, or, sometimes, a book they think is good but rather feel they should think it bad. Good books are rarely described as addictive, presumably because they don't need some extra element to induce people to read them; they are read because they are good, and they are good regardless whether they are read or not. But then, not every bad book is addictive. In my experience, I've felt that a book is addictive when it provides ample space for the reader to project themselves in the narrative. A world rich in (pointless) description; characters bland enough for maximum amount of people to relate to them, and simple enough that their motivations are easy to follow; hightened emotions (eternal love, jealousy, ambition, elevated friendship, etc.); focus on events in the plot rather than the plot itself or character growth; and, finally, a sense of comfort and escapism to the reader.
The Clockwork books hit pretty much all the aspects of addictive books (though the list is by no means exhaustive). There is a huge amount of completely pointless description of people's clothes, hair, features, and, curiously, the colour of their blood. I think I counted three or four separate mentions of what colour blood some creature had in relation to human blood: red, red, red, and red, respectively. I doubt there were ever more than two pages I actually read in their entirety because my eyes would just flick over all the endless description. Characters had their clothes described in great detail but their actual personas remained pretty blank slates - and I mean pretty, as in everyone is very, very pretty indeed, to the degree that it must be difficult to differentiate among all these beautiful paper dolls. People's motivations run the whole gamut from love to a slightly different kind of love, with a helping of desire, balanced by self-sacrifice (due to love). The plot serves only as an excuse to put the characters in situations where they can fight valiantly, or sacrifice themselves, or show their kindness, or get on with sexy-times. Poor Mortmain, even the author seems scarcely bother with his terrible, horrible pain and has tossed him in only so Tessa can angst about her triangle drama; it's not easy being a villain.
As triangle dramas go, this was one of the better ones because it wasn't just two people in love and then an additional person hankering after one of them. I don't mind a triangle, as long as exists for some other purpose than illustrate how awesome the heroine is and how her milkshake brings all the boys in the yard. This one was... maybe halfway there.
In conclusion, the Clockwork books are entertaining escapism, but the quality of writing is jarring. I might read the City of This and That books from the same author, if the rain continues, but I won't have any expectations for them.