There's nothing more satisfying than delaying the final boss fight until you've done everything else in the game and then going apeplop on him solo with Penelo and Wyrmhero Blade. =]
ROFL sounds like 1 shotting Sephiroth with Omnislash.
That to me is disappointing, but inevitable if you do as much as you can before beating the boss, which I always end up doing. The boss in FF2/4 I think was freakishly hard for me.