Personally so far my only complaint is the same complaint I have with "With Fire and Sword." Bows are too Powerful, and Gunpowder weapons are just weak... mostly because of the reload, anything stops reloading you have to start reloading all over again, to a point that there is no point using a gun most of the time at least as a player character.
Even Bandits with Bow/Arrows can be deadly once they get into range, were as on normal Mount and Blade you really needed high level archers or crossbow men to be deadly. Ronin Bandit Camps in short are next to suicide to attack because of it unless you have like Ji Samurai quality+ troops, being 2 out of 3 of them often are using a bow, and a two handed sword.
If it was possible to set reloading a musket in stages rather than a long tedious process that would work, either that or bows need another nerf when compared to Guns. I saw there was already such a change in the past but sadly it still isn't enough. I can kill like a dozen men per battle with a bow, while a musket I'd have to get lucky to take down 3-4 per battle, guns are just not worth using. Only time muskets are remotely useful is in pure "MASS" fire with mass of NPCs vs NPCs, and even then they have to hit targets multiple times for them to die for weapons that are inaccurate and shoot much slower than bows, which is sad for a weapon that made armor useless.
There just has to be a better way to balance Muskets. I want to use them myself, but they're so many cons and well like no real pros, and without enemies having shields using a bow on horse back is just happy hour.
I just started using this mod, and outside of that I think this mod is amazing.