Decline in Harry Potter Books

I think I have found out why the fifth and sixth books of Harry Potter are my least favorite ones. The reason is not that the books have gotten darker and the tone more serious. It's not even that Mary Grandpre's illustrations have become less cartoony. It's because all the character roles in which the readers got so set over the first four books get changed and turned upside down. For example, in The Order of the Phoenix Ginny stops being all crazy about Harry and starts dating, and in The Half-Blood Prince, Harry is "hungry" for Ginny (creepy). Harry becomes a very angry young man, the government are complete morons, and Sirius gets himself killed. Neville becomes less dorky and Ron gets on the Quidditch team.... It all adds up to a seriously confusing Harry Potter world the likes of which we didn't see in the first four parts. And that is why my order of favoritism is 241356. w00t.