The 'I' in 'Team'
This is a good opportunity to say that we don't ever want to play as anyone but Batman. The reason for this can be best explained by referring to what's commonly known as 'The Superman Problem'.
This is the idea that since Metropolis' super powered boyscout is a essentially an unstoppable god he's no fun to play and in fact ruins the majority of games he's in. Just take a look at Superman 64 if you need proof.
Sure Rocksteady could come up with some narrative contrivance to tone down his god-like abilities somehow, but we'd rather fight alongside a fully powered Superman than as a hampered one. That can be applied to Aquaman, Green Lantern and most of the other members the Justice League.