Now this one I actually think is alot more fun than the other two since you now can use alot of your good cards.
The only problem is that if you let him use cards from the other two games he gets really anoying at his highest Duelist lv since he gets to use an Exodia Deck if you got all pieces. That Deck just thins out really fast and he can get Exodia alot faster than Yugi did. However he is even more stupid than the other too so I asume his AI is completly halved compared to either kaiba or Yugi because he never does a smart thing, he simply has better cards than Kaiba and Yugi because he can if you want to use cards from their game. A good detail about this is that you can make sure that he can't use their cards if you go in to the option meny which is good and you yourself don't have that restriction.
In other words:He can't use cards from the previous games but you can. :D The cards you win here are also alot better than the ones before and it gets alot more realistic when both players have for example Call of the Haunted or Magic Arm Shield and stuff like that because you get to be more careful and try to bypass the Traps which are laid out.
This is indeed the best in the Power of Chaos series and it's really good.