I actually like the difficulty of the game so far. While I did complain about Chapter 5, it didn't take long to beat.
What really makes this game difficult so far (IMO) is the amount of money you have, how you manage it with your items, and the reinforcements that are either ridiculously strong, plentiful, or yield no experience.
Every chapter was beatable, more so when you know what to expect. Furet probably makes this a heck of a lot easier, as well.
The chapters seem to follow the same theme, though. You have beat the chapters quickly, or else the reinforcements will drain your weapons and/or kill you. Realistically, this makes perfect sense; you don't expect to kill everyone in a war/skirmish then again, we only have teenagers and people in their 20s fighting.