Some of my best gaming experiences have been on survival modes. CoD zombies, MWF 3 spec ops, gears of war horde. Even though the theory of a horde mode just sounds monotonous and boring, they seem to have the most replayability of any game mode I've ever played (for me at least) What will be the determining factor for me is the add variables within (loot drops, increased defense options the farther you get, the variations of enemies throughout the "waves") I love the idea of finding that one spot in the map that I can call my own, fortify it to my liking, and slaughter any enemy that tries to take it from me. I loved the raids but I have hopes that I will enjoy the arena even more. I will withhold judgement until I'm actually able to experience it however.