You can go anywhere(except inside any structures) in New York(almost), and you can earn XP(for upgrading, unlocking new combat abilities) by taking out a number(that resets and increases whenever you reach it) of whatever type of group you've worked your way up to(starting with gangsters), saving civilians(pick 'em up, take them to a hospital) and the like, and your allies will give you missions(for some reason, they remain in place. This is free-roam, like the Grand Theft Auto games. I tried a demo of the original of them, and one narrated by Stan Lee, and that's it.
This is the first time I've played a full one of these.