They are pretty good books. They have the same feel as Harry Potter, Hunger Games, and Percy Jackson. However, they do have more adult themes mixed in. I would recommend reading them before your children do. In a way, the settings are very similar to what I've heard in World of Warcraft. I wonder if Cassandra Clare is a video gamer... I am looking forward to see the first movie, City of Bones, coming out in August 2013. I think the actor for Jace is a perfect choice. After all, only Clary sees him perfect and dreamy, in reality he is a strong and intriguingly arrogant warrior.
The first book, City of Bones, was definitely the weakest of the three. The plot revolves around a teenage girl named Clary Fray, who begins to see a world she never knew existed. After a series of events, she meets with the mysterious Shadowhunters, who are a group of demon hunters. Together, they try to figure out what is going on with Clary and why she can suddenly see their world. The main problem I had with this book was that it was nothing I hadn't read before. A lot of the plot elements and big reveals are things that the reader has likely seen in other books, movies or TV shows. My other big problem with this book was the pacing of the story. I felt like this book could have shed about a hundred pages and would have been better for it. It took a long time for the book to get interesting for me. The saving grace of this book was the characters and their interactions. Sometimes it did come off as the author trying too hard to be funny, but for the most part the conversations between the characters were pretty amusing. The characters themselves were all pretty well fleshed out. Magnus Bane was by far my favorite character and I wish there had been more of him in this book. Overall, I'd give this first book 1.5 stars. It was decent, but it did have some problems.
The second book, City of Ashes, was a lot better and my personal favorite of the three. With the introductions of the world and the characters out of the way, more attention could be given to the story and pacing. The problems with the pacing were fixed in this second book and the story felt much more focused, while being far less cliched. Without giving too much away, Clary is trying to adjust to her new life given the revelations of the last book, while attempting to return to a semblance of normalcy. When a few mysterious murders happen and her fellow Shadowhunter is thrown in jail, Clary begins to realize that returning to normal may not be as easy as she thought. Easily the best part of this book was the character interactions. Most of the characters had more of a chance to breathe in this book and this leads to some very enjoyable conversations. The growing relationships between Magnus, Alec, Clary, Jace and Simon lead to some great funny scenes, along with a few very dramatic ones. Jace's problems in this book and the way that he deals with it seem realistic, making the reader feel some real sympathy for him (apart from the beginning). Overall, this book was a big step up from the first one that I couldn't put down. I'd give this book 3.5 stars easily.
The final book in the trilogy is the City of Glass. I felt it was better than the first book, but not as good as the second book. The story revolves around the Shadownhunters heading from New York to Idris, the Shadowhunter city, to prepare for the final showdown with their common enemy. Clary, not a trained Shadowhunter, wishes to go to Idris to seek help for one of her loved ones, but ends up being left behind due to circumstances beyond her control. The rest of the book revolves around Clary's journey to Idris and her role in what could be the final battle for the Shadowhunters.
There are some things I really like about this book. The pacing, aside from the ending, was pretty good and the story had a good mix of action and drama. The relationship issues that carried through the three books are solved in a satisfactory manner and characters like Simon, who previously annoyed me, began to grow on me by the book's end. Magnus and Alec's interactions in the book were by far some of the most entertaining parts to read. On the downside, the book's climax and conclusion were really cliched. I went back to feeling like I had read this story before in several different books, such as Harry Potter. The pacing of the epilogue was really slow for me since it had a lot of set up in it for the next book. I knew what was going to happen in the epilogue and I found myself skimming a lot of pages towards the end as it took its sweet time to get there. My other problem involved the actions of the main character Clary, who I thought did some pretty selfish things in the book. Thankfully, the other characters called her out on it, but it still irked me sometimes. Overall, the book was pretty exciting and well paced, up until the end where the pacing and story telling went down a byway. I'd give this book 3 stars.
I definitely enjoyed the trilogy more than I thought I would at first. After I got past the first book, I was very interested in the characters and the story. I would recommend sticking with it if you're having trouble getting past the first book. The second book and the vast majority of the third is worth it.