As a former full time musket user and current off-build musket user, i’ll just give a quick few thoughts here.
Musket in its current state is pretty strong overall. Overpowered? In most scenarios it is definitely strong. I do a lot of testing myself and the problem is the weapon itself, not people not gearing up correctly or at all. Light and medium users, even with resilient, physical aversion, full emeralds in armor (thrust gems, which nobody would use anyways in pvp), still get hit insanely hard, with numbers up to 4.3k for light and numbers up to 3.5k for medium from a fully decked out musket build. It is pretty insane that the musket can shoot from the distance it has, also with the passive perks you can choose. Example: OPR - You are able to get onto of the tall mountain at Moon outpost, or used to. You can shoot from the top of there to the other side of Sun outpost. Doesnt help when you get a 3x scope too. Or, Scorched Mines - there is a way to get wayyyy up basically above the mines and snipe down. These are just 2 spots of many on the map where everyone is rendered useless as they cant get to you but youre raining down fire, sometimes with 2-3 other people next to you with muskets too. Pretty insane if you ask me especially when the only way to counter this is to use musket or bow and everyone else is rendered completely useless. But, thats the high ground scenario, to which it is ranged so I dont expect a hatchet to fight against it, and thats not the point here. Close range it is still pretty strong. I have had my fair share of instances where I do get deleted when someone gets close because I was just unaware, but most of the time when I did notice and was fully aware, I got away nearly every time. Haste + stopping power + fleche + evade just makes for an insane time running away in even medium armor. As for the musket itself, mobility is still pretty good and if you know how to play the stopping power and sticky bomb abilities right, you can get away too by not even using a rapier. The damage output of the musket, just by itself is decent, wouldnt say too much or too little, but once you add in the 3x headshot reload perk, 3x scope for way easier targeting and dodge instant reload perk with the ability to gain haste to run away, it becomes decent fire rate with high damage output and quick mobility. And we wont add in the aimbotters that are still going around on some servers that will always get max damage, hit every shot and always get the insta reload perk for headshots.
I think the main problem people have is in OPR, the map is pretty good for musket users as they have and open field to shoot at with tons of spots to climb on and shoot down at most people fighting, especially if you are on the moon main spawn team where you get high ground advantage off the start. Same goes somewhat for wars, but usually not as much as you will have musket users on your team guaranteed targeting siege, and if not then the people on the fort wall. As for open-world, it is a lot easier to fight here against them as there is more cover, more often than not, that you can jump to, but even still because of this it favors a musket user like myself as I can just use the haste and rapier to run away and climb up mountains and then jump down if they get up to me or just not look back and keep running. And to people saying at close range muskets are rendered useless, while it is extremely hard to fight close ranged with a musket, this is not the case at all as your mobility and stun from rapier with staggers from muskets can win you fights against 13k health ga/wh players if you play it correctly.
Overall, if the perks you could choose in the musket tree were either different or changed, i’d think you’d see a little better of a response from most players, but even still youre getting into dangerous territory of making the musket way less useable at that point. My top change would be to increase the cooldown on the dodge to insta reload as I find this to be the main reason why I can shoot quickly most of the time. But these next rapier changes will also be interesting for muskets users just as much as it will be for life staff users, so we’ll just have to see what happens. Just some thoughts from a person who still uses musket.