I like the final battle the most, particularly knocking off of the platforms but didn't like having to do away with his sword a little later since it healed itself. I didn't take much damage and i never died but it did take me a long time to eventually break his sword, but i really liked the way he looked and the sounds his body made when you hit it, very delicious. =]
My least favourite was the fire sanctuary though, the setting didn't fit and he didn't have much business being there. One of SS's weak points were its bosses and I really disliked having to fight the Imprisoned and Debbie three times throughout the game but at least Debbie stepped it up for the final fight.