The stars

Last week, I bought a new game called Mass Effect 2, while playing i realized that while they were in space the mentioned little about earth. humans, who had lived on other planets for millions of years and have never seen or heard of earth. And i began to wonder, what will earths legacy be? If their are aliens out there how would they judge us for our wars and what little we have done for piece? And will we ever live t see a day when we all can truly get along or is that a myth?