Maybe it isn't a big thing for me because I see other things as being more important, maybe it's because my daughter liked the Lemony Snicket "A Series of Unfortunate Events" better than HP, she doesn't care about the new HP movie, and my son has no interest in the books or the movie (he thought the first one was boring and silly - he's not a fantasy kind of kid).
Just like TV (which is far worse than any book a kid can read), you can steer your kids to other things to read and/or watch.
I'm much more concerned about the kids my kids go to school with each day. Talk about losing a soul - schools are first and foremost in your kids lives.
Funny you should mention that -- Lemony Snickett is the latest rage in our household too. And I do find him very troubling, even though once again I'm the one who introduced these books to the kids. I noticed them on the shelf of the library and pointed them out to the kids since they seemed like very intelligent and sophisticated books for kids -- which they certainly are.
But they are also problematic. Has your daughter read the latest, "The Carnivorous Carnival"? And the interim volume, "The Unauthorized Autobiography of Lemony Snickett"? Terms like "bizarre" hardly scratch the surface. Last week there was an interview with some actor in the Wall Street Journal, and he said that the latest book he read was "The Unauthorized Autobiography of Lemony Snickett." He had no idea it was a children's book until someone told him. At which point he said that was totally bizarre because even adults couldn't understand it.
My son brought back with him from vacation (with the same sister who sent us Harry Potter) a book called "Artemis Fowl," I call it "Artemis Foul." It really sinks to a new level of despicable for children's literature. It may not appeal to girls, however, so it may not be a concern for you.