I like Earth 2 because they can do real changes on that world. They killed off Batman on Earth 2 and you saw people like Robin and Huntress step up to try and fill his spot. They didn't have Batman stay dead for a year and then come back. I liked that they could do things with the Earth 2 characters they could never do with the main U versions. Even in the Nu52 Earth 2 series they used this by not only having Batman dead but also Superman and Wonder Woman. It just opens up so many story avenues you can't do otherwise.