I also am very suprised with people saying it is too hard. 'Extreme difficulty level'?!?! I was dissapointed that this game was too easy (seemed much easier to me than the famicom version). You literally don't have to level up at all. And I agree that XII (for example) is waaayy harder. In the first place, I don't understand why difficulty would be a weak point...
Difficulty is obviously subjective, but if someone thinks this game is too hard, then they must think some of the other FF's are difficult to the point of being unplayable.