There is no reason to do anything in this game. You have all of these leves, behests, a few storyline missions. Lots of stuff to do, but there is no reason to do any of it. Even the storyline missions. You walk to a point on a map, watch a CS, most of which aren't that great, maybe have a little fight and that's it. There's no epic revelation, no awesome piece of gear, you were told EXACTLY where to go so there's no thinking involved, you didn't have to fight or sneak your way there, you didn't have to bring your buddies all geared up with the right food and strategy, you just walked over mashed a few buttons and went back to "stuff". How many of us have failed a storyline mission? The answer to that should tell you something. You SHOULD be failing new content.
FFXI had lots of "stuff" to do as well, stuff that wasn't particularly exciting or fun on its own, but you always had a goal. That's what made it epic. You were always working towards something awesome and that something was always just out of reach.