JMS is currently writing the script for the Valiant Comics film adaptation of the Shadowman comic book and offered his thoughts on not only the difference between the two genres, but on the disappointing Green Lantern movie.
Regarding the Shadowman movie, JMS noted there has to be a difference between the comics and movies.
We had talked about the difference between the 'Shadowman' movie and the 'Shadowman' comic, and the good thing is that the folks involved understand that there's a difference between a movie and a comic book. There were times when they said, 'We're doing this in the book, does it work for you in the movie?' Some things did work and we're going to carry them over, and some things did not and I said, 'We have to leave that out.So what about the Green Lantern movie? As many fans have noted, the movie seemed to have a hard time deciding where it should take place. Earth or Space? Seems JMS felt Earth would have been best.
In the Green Lantern movie, you want to make this character special, one of a kind, the bravest guy on the planet, and then put him on a planet with 10,000 just like him. The fan part said, 'We should have the whole Green Lantern Corps there.' Someone should have said, no, the movie side say, 'Keep him on his own. Don't bring them in yet. Let's make him special on his own first, then, two movie down the road, we'll bring in the whole Corps.(From CosmicBookNews Via Blastr)