I would have liked to have seen the Sannins fight as a team and how they held up against Hanzo and his ninjas. That would have been really cool. The three of them demolish an army while everyone is dying around them. It was very cool nonetheless.
I always thought Jiraiya had a reason to run about the world. This is really putting all of that in perspective. I loved it. His sage mode training was rather lacking however or what little they showed. LOL!