Personally I prefer the more sandbox style MMO as you feel more a part of the game world, its more of your own adventure rather than one all laid out on a linear path for you, the problem with games like The Old Republic is that you start your character and your pretty much restricted on where and what you do next, do these quests and move on to the next bunch of quests, sometimes you feel like just stepping back and wanting to have the freedom to just do what you want to do rather than what the game is wanting you to do, I enjoy questing on XIV but I'm glad its mostly optional, free to do when you want and not the only way to progress.