I was thinking that a general discussion about such movies might be doable. It might simply be whether you liked the movie or hated it, or which particular parts about them that stood out in such a way. It could be about their adaptation, or the details concerning the discrepancies between the movie and the source it was based on.
And, of course, I bring this up without any real idea of what I could contribute to the subject... ;/ Well, to be honest, I'm not a big fan of adaptations in general, mostly because I have no attachment to the original work. I think, out of all of the comic and book-inspired movies I've seen, the only one I've both read and watched was The Hobbit.
I never got into American comics, save for a time when I read Archie (which included Sonic the Hedgehog). So, of the movies I know were based on books...
The Princess Bride: It's just one of those cult classics, I guess. Just slightly whimsical, a bit witty, and... wait for it... true love. ;p And while I'm not into wrestling, after watching a biography on Andre the Giant, his presence in the movie actually increased its value to me. It's also chock full of quotable dialogue, which is good for making references (of which I like to do).
Chitty Chitty Bang Bang: This one really stuck with me when I was a child. Musicals are generally on the outskirts of my interest, but I actually liked a lot of the songs (like "toot sweets" XD ), and the setting was kind of odd and interesting. Movies these days just don't have the kind of adventure you get with this one anymore.
Dune (1984): Another movie from my childhood. I know the film didn't get a good reception when it came out, but the setting and visuals left an impression on me. Some people spoke in weird voices to control people, there was the "flying fat man," riding giant worms, using one's voice as a weapon, among other things.
Mary Poppins: A second musical? And one that also stars Dick Van Dyke? Yes, indeed. Much like with Chitty Chitty Bang Bang, I also liked the songs in this one, as well as the setting and the whimsical stuff that usually happened during the songs.
The Neverending Story: Just the first movie. Like Dune, the setting and visuals left an impression on me. There's the various creatures, the adventure, and the magic of imagination in regard to creating a world for someone to explore.
Now that I notice, all of those movies stem from my childhood. What can you do, right?