The combat in this game was mind numbingly easy and boring. I didn't come close to dying once in the game. At that point, being able to purchase more powerful attacks and combos doesn't mean much other than to hopefully speed up the boring battles. And outside of dungeon crawling and upgrading your characters, there's almost nothing at all to this game.
So it's a game based on battles and the battles aren't any fun once you realize there's no challenge and you don't really gain anything by making your characters more powerful. I wish they had gone for a battle system like they did with Rogue Galaxy. That game was lots of fun. Or that they had added tactics and challenge to make it more like FF XII, which was also really fun. WKC was not much fun.