But they never really do. Or your idea of a re-hash is not what others may think.

Who would be interested in the Avengers vs.... Captain Noway and his League of Nowheres?

So, to some degree all the movies are 'adapted' from comic stories.

In the worst case, Galactus is a giant cloud.

In better cases, we get CA: Civil War, which jumps from the comic's memes but goes a bit beyond, in my opinion.