I think it has to do with chance, as well as your stats. If I'm not mistaken, there's an accessory that increases your chances of getting a critical hit.

I used to think that all you had to do was use your mist charges and win everything easily, but if you do any of the side-quests it isn't that easy. Your overdrives just get worse and worse eventually, to the point where they become almost useless. I found that the best strategy was to use reverse and lure on one character, put him on berserk and haste, and while he's going wild get the other two to use supportive magic to keep him like that. A mist charge might do about 30,000 damage, but with that strategy you can get more than that in a matter of seconds.

Sounds well thought out. your thoughts or did you have inspiration?

No lol I didn't think of it all myself. I found out about the reverse and lure trick, but then theres a lot of other stuff you sorta have to figure out on your own while you're doing it..

Ah because when i was reading it, i was remembering how i played ff12. and i was like.... shit! I didn't think like that lol.

jst make sure u hve enough items... then get rid of all their statuses n use reverse at all times... the mist charges r useless because u really need the mana during the fight...

Basically, in what everyone is trying to say is that each person who plays an FF game will undoubtly use the same strategy. I don't see how you can use oyur own tricks, though, because you're most likely to screw up the battle.