I like Harry Potter. I do not LOVE Harry Potter. I bought The Half-Blood Prince when it came out last weekend, but immediately gave it to my boyfriend to read first. I'm certain that it will be perfectly enjoyable when I get around to reading it.
On the other hand, I definitely enjoy supporting J.K. Rowling and her Potter series against the hard-core fundies and their seemingly endless list of grievances towards Harry Potter, imagination, literacy... I could go on and on! Check out Bookslut's recent article, A Masterpiece of Satanic Deception, then read this review of an anti-Harry Potter video.
I also recommend this recent Wall Street Journal editorial (found via Kottke.org), which takes Harry Potter symbolism in an entirely different direction. JiminyCricket81, I'm particularly interested in your take on The Order of the Phoenix as an allegory for 1930s England (i.e., "Voldemort" as Hitler, "Dumbledore" as Churchill).