I guess "normal people" just don't like the Narnia stories as much as those other ones. Except for maybe The Lion, the Witch and the Wardrobe, none of the books is part of our culture like Harry Potter or Alice in Wonderland. Don't ask me why not.

I guess the easiest answer is that the movies weren't as good as those movies you listed. (Well, the answer that the public has bad taste is equally easy, I suppose.) I'm guessing though that a lot of those movies and TV shows are also worse than the Narnia movies were. I'm really not inclined to analyze all of them to figure out what worked and what didn't.

I can think of two possible reasons.

1) The Narnia books are thought of as "children's books".

Arguably, Harry Potter is also a series of children's books, but I think they shifted more towards YA as the series went on, whereas Narnia is definitely children's literature. It doesn't matter how good a children's book is, some people won't be able to get into it simply because it's a children's book. I've seen the same thing with animated movies.

2) The Narnia books are thought of as "Christian books".

In a sense they're right. Aslan is pretty much Jesus and there is a lot in them that is spiritually relevant for Christians. However, when a lot of people think of Christian fiction, they understandably think of preachiness and poor story-telling. Even I do and I am a Christian!

In the era of the Walden Narnia films I would often hear Narnia as the subject of jokes, much to my dismay. It seemed like no one really took them seriously - ad it was usually for those two reasons.

And then there is the weird thing that Col Klink pointed out that I have never understood. Everyone knows LWW, but for some reason the rest of the books just aren't in the public consciousness. I don't get that at all, but I could see it being a contributing factor.

It is interesting that in an age when the concept of "fandoms" is so prevalent that the Narnia fandom has never quite reached the mainstream. I wonder what it would take to walk into a Hot Topic store and see Narnia merch.

I guess "normal people" just don't like the Narnia stories as much as those other ones. Except for maybe The Lion, the Witch and the Wardrobe, none of the books is part of our culture like Harry Potter or Alice in Wonderland. Don't ask me why not.

I can't vouch for Alice in Wonderland (although it has had a long time for successive generations to read, plus numerous film and stage adaptations), but one major factor with the Potter saga is that it was seen as a big money-maker by the publishing world. In their 20 years of existence, so much publicity was lavished on these books, with personal appearances, huge merchandising (everything from lunch-boxes to costumes), long articles about rags-to-riches Rowling and her supposedly original creations.
In fact, she was a well educated woman with a good grasp on the literature of several countries, and was not working because she was a full time mother (separated from husband). She drew from a number of conventions of children's stories and traditions, and mixed in some of her own ideas. She was capable of working with the publishers/publicists, and the rest is history.
No, I'm not a fan, totally the wrong generation, but I don't actually hate her books.

It is curious that the general audience don't seem to have the same love or knowledge for the Narnia books that came after LWW. For the PC and VOTDT I will say they performed a lot better overseas than they did domestically.

I don't know what they could do to perform better.