I swear I honestly can't do this series enough justice except with my love for it. Revisiting these books is like a family reunion. The ones we love never really leave us, like Sirius puts it. We're introduced characters that are very central to the later books. I always found that this book warns us for the horrors and impending fates in the later books. It's so dark and mysterious, and we do find some answers, however little they are.
J.K.Rowling really plotted her novels out. You can tell simply by every time you reread these books. I'm always finding little things here and there that make me go "ah-ha, makes sense why that happened in 'x' now". It's the connections, the little itty bitty stuff that really adds to the experience at times I find. xD
Now onto the 4th Harry Potter book, I must catch up with everyone else! >:3