I'm currently playing FFXII i have my whole party (6 Characters) at lvl 46 (with arond 50 hours of game) and am pretty advanced but im kinda dissapointed with the game, i mean the gameplay and graphics are great and all but the story its way too simple it's just not what I would expect from a FF.
But IMO the game isn't that hard how some people say just for some of the recent bosses that when low on HP go on some kind of berserk mode which gives them tons of defense and power (it cant be dispeled i already tried it >_<) and can get a bit challenging, and in the beggining quickenings make the game way too easy.