My issue is that I think many of the authors that wrote the original modules for D&D could write circles around many of the Hollywood script writers. So at times I wonder why they just don't take part of a module (like The Keep on the Borderlands, for example) and write a movie about that. I know it would have been a hell of a lot better than the tripe that they decided to plop onto the screen.
Heck, you could make an excellent movie on the encounters prior to the Caves of Chaos (imagine if they did a movie on the lizard men's mound, the bandit camp, the spider's web, and the Hermit (man, I love that hermit!)).
The only ones that probably made better stories (yes, to me to some degree the modules are stories) would be loremasters like Homer. (Sorry, to me they haven't met Homer's standard, but they're still pretty good). Then, I wouldn't mind it so bad if the movie tanks. Poeple outside the game could appreciate the modules that allowed us to gain a love for the game. I've owned Descent into the Depths of the Earth for 20 years, and I still like to open it and read it from time to time. But, to watch my favorite game get dragged down by movie trash like that D&D movie just drives me crazy.