Again, Orson Scott Card hits the nail on the head. Note: this is pretty much a spoiler-fest here, but if you've read the book, go read hs article:
I tend to agree with him. I'd much rather live in a world surrounded by people who grew up informed by the Potter books, rather than one where the main literary influence was, say, Sweet Valley High, Goosebumps, or the Babysitters' Club.
Harry Potter not only allows for heros (a rare thing in YA literature these days, believe me!), but also for sacrifice, mercy, remorse and forgiveness (oh, how remorse/forgiveness plays out in book 7! a major theme, and well done, Ms. Rowling!), justice, compassion, and....well, I won't say the last one. But the epilogue will give you an idea of the other values.