Too easy? O_O There's been a fair few missions where I've just wanted to rip my hair out because I was so close to completion ... and I lost.
I'm currently on Chapter 8-4, where you have to first fight Chaos, and then the Judge of Wings in the Feol Warren. So far I've died every time. I can kill Chaos easily ... but JoW pwns me

I miss linking my Quickenings together for uber damage :(
I think it might be because the JoW is level 50 ... and I'm about level 31-36 ... I may need to level up a bit.
Other than that ... yeah, I can say it's fairly easy. I mean, there's a save point after every mission and at the start before you start one. The key too success is using the Varhi correctly (I
refuse to call them Espers). If you have a level III Varhi ... you usually win XD My favourites are Ifrit and Leviathan.