I'm saving most of this for the retrospective I'm still working on, but I would say how much the game throws new things at you. You get a taste of power with Magitech armor, have to play a psuedo tower defense game with three teams of moogles, navigate a river, choose one of three scenarios to play through, solve a mystery in a town turned dungeon, do an opera, recruit a party member who randomely leaves you, the new mechanics each new party member brings, explore the enemy base to talk to people, dialogue choices with some weight to them, characters the party actually has the power to have killed, puzzle dungeons, nulti-party dungeons, and then the damn World of Ruined which cracks this whole thing up into an open world game filled with even more of this stuff. The game is just always throwing something new at you.