What books have eagerly awaited and then been dissapointed by?

I recently got the first five books from Jim Butcher's Dresden Files for a lovely reading marathon. I love paranormal stuff, and he came so highly recommended I was champing at the bit in anticipation of a new series with many instalments to look forward to. I've only managed the first two and am really disappointed. I can't figure out why they haven't clicked with me. Have you ever had this happen with a book?