Some people call this frustrating. Some people call this BS. Some people call this easy. I say...well it's inbetween.
Sphere Break can be difficult if you're just challenging whoever without a care. You essentially need to find the weak opponents and beat them. Save after every match. The final match....well...it's Shinra. And Shinra I would say he's a hard opponent but compared to what you can face later. Oh god. He is tough and you're gonna have to have a little bit of luck on your side to pull off a win. Which doesn't happen here.