It's true, not all YA books that become movies are good. That said, let's take a look at some popular YA SF/fantasy books and series that I never got into. These all have movie adaptations or are rumored to be adapted to film.
In no particular order:
- The Mortal Instruments by Cassandra Clare - City of Bones is the first book in the Mortal Instruments series and the only one I've read. I haven't read any other books in the series because City of Bones just wasn't good. It's a derivative of every cliche YA paranormal book out there, which means the characters are nothing special and the romances don't make any sense.
- Matched by Ally Condie - Matched suffers from the same problems as City of Bones, but it was a better written book. The love triangle in Matched made absolutely no sense to me, and as a result, I haven't read any other books in the series and don't plan to.
- Leviathan by Scott Westerfeld - I'm a big fan of Scott Westerfeld's Uglies series, but Leviathan just didn't do it for me. I think the problem may be that it was written for a younger audience than I like because I felt the story was shallow and the characters uninteresting. On the other hand, Suzanne Collins' Underland Chronicles are targeted to the same or younger age group, and I like those books, so who knows.
- The Passage by Justin Cronin - I'm not sure if The Passage is a YA book or an adult book, but since it shows up in many lists with other YA books, I'm including it. This book had a good premise and showed promise, but it was just way too long. If it was 300 pages instead of 800, I bet I'd like like it a lot more.
- Twilight by Stephenie Meyer - I admit that I've never read any of the Twilight books, and I don't plan to. I blame this series for the popularity of YA paranormal romance and the stupid love triangles that you find in too many YA books today. While I will avoid Twilight, I have nothing against Stephenie Meyer as an author. I've read The Host and liked it, as well as its movie adaptation.