Hm.
I didn't mind the first book...it was pretty okay. (The dragon was nice.) But Eldest had those annoying elves. I didn't read Brisingr, but I read the wikipedia article on it so I know what happened. Then I read this article on how some scene in the first book (the three-spikes-on-the-rock thingummy) was making fun of the Trinity*, so if that's true...maybe a 5ish?
The Chronicles of Narnia.
*I put that in the Socratic Club, if you want to read it.