Earth in DS2 is 100x better than Cortana in Halo 3. Earth is not built of brown slime. On Earth, you get to blow up cars, hit on angels, and get to tote a badass grenade launcher around. Compare this to Cortana, where half the time is spent cowering behind a corner to wonder where that pesky sniper flood is at until you go into spasms induced by Gravemind. Cortana contains almost no weapon drops and very little useful ammunition. On Earth there is a freaking redemption with unlimited ammo laying around every other corner. I think Earth is closer to the zombie surprise level in Uncharted than it is to Cortana. I don't mind a little survival horror thrown in the middle of my RPG for a change. Cortana on the other hand is just annoying.