Challenging, but still entertaining.
I actually enjoyed this. Moby Dick was a difficult opponent but not to the point it became frustrating. Once you've learned all his attacks, it actually becomes a pretty epic fight.
The animation is average, the music is great, and Ahab's voice acting I personally found hilarious.
As others have said, the jumping is a little irritating, as Ahab floats as if he was on the moon.
Nevertheless, this is a difficult but enjoyable game.