I loved the His Dark Materials trilogy. I found them exceptionally well-written for children's books, dealing with major themes. The "anti organised religion" theme worked well for me personally. The first book was the best, then the second. I liked the last one the least for some reason, maybe because I hated the ending (too sad for me!) :oops:
I did not enjoy the small book Lyra's Oxford - I found it an expensive waste of time. It took the story nowhere new IMO. I was expecting much more of it.
I have read a couple of his Sally Lockhart novels, set in Victorian London, which are completely different but also very good. I own the other two but have yet to find the time to read them.
I have also read a couple of his other books, which I found extremely disappointing. I think one was called The Broken Bridge(?). To be honest, they read like they'd been written by another person entirely. Perhaps they just go to show how Pullman has improved as a writer, as I think they were his early works.