One of my favourite things so far has been some how of the ambient chatter hints towards a larger universe. Militia using the term 'metahuman' while another tells him to quit it because 'they're just freaks'; thugs saying they'd rather occupy Gotham than Keystone because 'at least they can see Batman coming', whereas Flash would be a red streak and a bruise. Coupled with the sheer size of the map you're allowed to play around in it really does a good job of making you feel like this is your city, but you belong to a larger, cohesive whole.

Plus you get to [u]drive the [b]freaking batmobile how [i]fucking cool is that!?[/i][/b][/u]