During 1.0, I would have said almost everything, BUT, how it handled the leveling side.
Now in 2.0, I miss FF11's sense of adventure. The fact you could go about anywhere if you were willing to risk it and that sense of danger that came with it.
I really dislike how exploration is locked behind MSQ, it bugs me to no end, but really-- That is my only problem and I can look past it for the greater enjoyment with friends.