FABLE:TLC
Jack of Blades was insulting easy, even with all the minions he spawned. He was an easy fight in both the original ending and in the extension. I had more difficulty running around the jail in my underwear looking for my belonging while guards wailed on me then I had fighting Jack. And afterwards nothing changed in the game world if you chose to wear the mask and become part of him or threw it into the lava. It all felt so pointless.
It felt so blah. Though the whole game felt blah. Nothing really changed. Being evil was insulting easy - especially when I figured out I could murder who I pleased outside the cites and the guards didn't give a damn. I also found that with the right haircut and mustache I could woo any woman at 100% evil, then kill her after receiving her dowry only to woo the next. Hell, it was despressing killing a city, renting it all the buildings back out to them and then having the women still fall in love with you when you come back to collect rent after your 8 minutes are up and the 230 murders are forgiven. Literally - only 8 minutes if you teleport out.
So yes, a game to beat that fight would be hard pressed and honestly I don't think I could play it long enough to get to the final fight. Fable was almost tortorous to finish, I did it out of pure stubborness. I mean really, even if you were terrible at the game the amount of potions you had by the end would ensure a win no matter how many times you died and ressurected by potion. And no matter who you killed in order to get to the boss fight (you had a choice to kill living people for souls or collect already dead ones) nothing in the game world changed. What a waste of a boss fight.