The difficulty curve is just really, really bizarre.
The normal enemies near the start of the game are fine but the bosses are oddly difficult. Partially due to the AI being a bit rubbish at dodging attacks (most of the early bosses are big with slow wind-up attacks, so as the player you shouldn't have much trouble), the AI problem led me to actually soloing one of the bosses (Gae Bolg I think?) early on because I was sick of having to baby sit the AI so much. But also due to really odd design decisions too, the boss after that, the game decided to use it as a tutorial fight for a new party member - but forgot to make it a bit easier due to the fact you'd be playing with a character you're unfamiliar with. You might be able to swap back to Yuma despite that fact, admittedly I didn't bother trying since I did beat it anyway as intended.
Following that though, the game becomes really easy for quite some time. That is until around Chapter 5 I think I'm on - can't remember specifically, where the games deciding to spike in difficulty again.