the beginning is kind of confusing and there's alot happening....but it keeps you guessing, and, like the past four books, it all makes sense in the end. there's even some stuff explained from the past books that play and important role in the plot. and, being the nerd that i am, i'm going to go back and read again it was so good!
And when you finish with HP, here's a really good book to read: The Perks of Being a Wallflower. I forget who the author is, but it's really really good. some other good books are Pure Sunshine, and Cut. Both books are by this company called PUSH, and they publish all books written by young authors.