I know what you mean, for me it was the Harry Potter series that will always have a space in my heart, even though I'm older I have realised a fair few flaws and don't rate Rowling writing as highly as I used to.
I haven't read the Demonata yet. My boyfriend owns, I think all of Darren Shan's books so I just steal them from him but I think I might leave it a bit til I read those as I like to have a variety of books to read but they're definitly on my list The Saga of Larten Crepsley, is kinda just a breif overview of his life rather than an full on story like The Saga of Darren Shan it just kinda highlights main events but it's still lovely as it shows the origins of other characters as well as Larten, it does make me kinda sad reading about Larten's life considering the events that occur in The Saga of Darren Shan but it's lovely to kinda reminisce a bit as I grew so fond of most of the characters in the series.