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That is probably why the older Justice League cartoon series (1990s - 2000s) worked. They started with Batman, went forward to Superman, and then the Justice League. Batman was not invulnerable. When stuff got to world destroying levels, Batman would leave the picture, or find a clever way to defeat the enemy while the heavy hitters hit stuff. In a cartoon, you don't have to focus on Batman all the time, you can leave him out while the other do things. (Of course that was also the series that had Superman underpowered by his own fear of killing people and hold back most of the time. "World of Cardboard")
In a motion picture though, you need to give all the mains screen time, motive, and something cool to do. Batman, aside from being that universes' greatest detective (aside from Holmes, but he's dead), is also Mister Got Bucks. Bruce Wayne can finance the Justice League when needed (the Watchtower for instance). He has the resources to get stuff to happen where strength can't. His early hooks to get him involved with the others is usually something major enemy influtrates Wayne Enterprises building and steals stuff, or uses Wayne Technology for some major alien invasion or something. That or some odd dealings between Wayne Enterprises and Lex Corp. That gets Bruce Wayne involved or the Batman investigating his own property when the likes of Superman comes in to deal with something Earth shattering. If it is truely major, as in massive alien invasion kind of stuff, you will need more than just Superman to deal with it. That is were the others start to come in, because Superman cannot be everyplace at once, and if it takes him a minute to deal with something here, that's a minute he can't be someplace else. Enter Green Lantern, Wonder Woman, Flash, etc....
Batman would be the one investigating where or how the aliens got to Earth, or how to drive them off while the others simply try too keep the damage to the Humans at minimum. He could eventually figure something out that turns the tide and allows the rest of the Justice League to finish driving the enemy away.
At least that is more or less how the older Justice League cartoon started.
And yes, all the Justice League fears Batman. He knows all their secrets and weaknesses. Sometimes without them even knowing he knows until he saids something about it (like telling someone to his masked face who he is, where he works, and what his favorite toy was as a child....because depending on the writer, Batman is crazy prepared).
Batman is also the only one Superman will trust to keep him in check, allowing him to keep a sample of Kryponite, just in case.
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