I actually really liked the battle system, but then again I really enjoy juggling numbers. I don't get why people knock on it for being complicated.

1) Attacks and Magic cost action points
2) When other character members attack or use magic you gain action points
3) The last three elements are recorded on the battlefield and affect the elemental strength of any new elemental attacks used.

Now, if you don't like it because it isn't dynamic enough that is another thing.