Original scores are good, but so are well placed established songs that you wouldn't hear unless they were in the movie. Like Daredevil had this awesome song I can't get enough of. THe best is a blend of original and other music used in all the right scenes.
If anyone remembers the Killer Instinct CD that came with the video game years ago, I used a few of those songs in my original GB3 idea.

ELFMAN all the way!!!

Or, they could hire me to compose it….