The "activate during critical health" thing was inspired from (maybe even a callback to) when FF VI was doing it, called "desperation attacks" in that game. And it's not so bad. Enemies aren't all that tough in this game, not unless you level grind a lot, since enemies level up as you do.
My favorite is probably Zell's "Armageddon Fist", which is just spamming Punch Rush and Booya! over and over again during his "Duel" limit break. Dishes out a lot of damage (especially if you're given quite a few seconds on the timer), and you only have to push 2 buttons per move to do it. :3 Not as flashy as some of the other moves the characters can do, but it gets the job done.
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