In the Box cover art of the movie Justice League:Doom Batman is featured more prominently compared to the rest of the JLA members (who are on his batarang). Is there a reason why one member is given more prominence over the others? Has this been done before, albeit with other characters given the limelight?
The IMDb page you cited gives this teaser at the top:
And this synopsis:
It would seem that Batman is the main focus since it was his files that were stolen, putting the rest of the team at risk.