It's interesting to me though, because the world of Narnia has ALL of this: false Christ figure (Aslan), sorcery (after all, the story IS called, "The Lion, THE WITCH, and The Wardrobe"), magic (winter all the time... and did I mention... A WITCH? Also, last I know... talking animals, besides a snake and Balaam's donkey, aren't a regular part of unenchanted life... ), and potions (Turkish delight, the drug of Narnia.) I understand Harry Potter having dark themes, but Narnia has a witch who hates and could care less about killing children. Last I knew, that was pretty dark.
I think it's fine to be convicted of something. I myself am convicted by some Disney movies but not others (I felt convicted by "Hercules" because it's a story built on other gods) and I think it's fine to voice an opinion.
But where I think there's a problem is when someone judges or condemns other people based only on their own convictions because they assume EVERYONE should believe as they do. Some people's convictions are just different.
I never got into Harry Potter or Narnia, and I love fantasy. But if you're going to tell me it's evil and that Christians should stay as far away from such things as possible, then don't tell me about why I should go with the rest of the congregation to see Narnia. And as Molly pointed out, if someone is going to preach against one thing (condemning others for watching or reading certain things), then it seems only right that they live what they preach.
I find it absolutely ironic (and hypocritical) that the same Christians who calls others weak in faith or evil for watching Harry Potter will do so while wearing a Superman t-shirt or bragging about owning comic book issue #1 and how it's worth a gaggle of money. Then they go home and watch shows or movies about mediums (hello... witches!!) and seeking out the supernatural, all while giving their 5-year-old daughter or granddaughter an "Elsa" doll for her birthday (I hate to be the one to point this out, but nothing in the story says that Elsa got her ice-freezing powers from God.)
All I'm saying is, if someone lives by their own convictions, great! That's how it's supposed to be. But if they start pushing THEIR convictions on other people, they need to either have a logical, consistent reason/filter for EVERYTHING or at the very least, show consistency in the way they live, because otherwise, this is a good example of why so many people think of Christians as hypocrites.