Check out Harry Potter and the Incredibly Conservative Aristocratic Children's Club at The Awl. The author, Maria Bustillos', thesis statement is "The multitude of sins committed in Rowling’s imaginative but horrible story can be roughly divided into three classes: ethical or pedagogical, literary and political." She makes some good points. For instance, I, too, find Dumbledore to be an odd figure who is always saving the day and ignoring a great deal. But she undermines her arguments with her tone and her personal attacks on Rowling.
Check out the comments, which end up veering off into discussions of His Dark Materials and C.S. Lewis and probably many more things. (I had to give up. There are a lot of them.)
J.L. Bell responds to the article at Oz and Ends. A discussion follows in his comments, too.