I've played judgement from the get-go and love him to death. However, I notice that he falls off horribly when fighting certain classes, and if he doesn't use a katana or scimitar then every other class can fast-combo staggerlock him to death, and there's nothing he can do about it except eat the combo. His attacks are slow but powerful, and that's fine, but his fast attacks have one of the absolute worst movesets in the game. Very rarely do I ever hit anyone with the stab, which seems to have no range whatsoever. The side swipes are pretty hard to hit with as well, and also have little range. Phalanx is his worst matchup, as he outranges and is faster than judgement while still dealing brutal amounts of damage. Phalanx's heavy attacks are extremely long range, and in most cases it is impossible to strafe, counter, or roll around them. Ryoku and Pure are relatively fine aside from the shared "fast combo stunlock" part.
To counter stunlocking, you need to block. Only the katana and scimitar are able to block in this game. Other defensive mechanisms, such as parrying, usually aren't viable at all. Blocking on the other hand is a top-tier defensive ability that is useful against anyone. It is unfair that weapon choice dictates whether you can defend yourself or not.
Phalanx is slightly overpowered imo, and a range nerf on his power attacks is greatly needed. I've heard people complain of Ryoku's near-useless power and balanced attacks as well, so maybe they need to be looked at too.
IN SUMMARY:
Either let people choose what defensive ability they want to use regardless of weapon, or make blocking a universal mechanic among weapons.
Buff Judgement's Fast attack range, or give him an entirely new fast moveset.
Nerf Phalanx's Heavy attack range, and maybe tone down the range on his fast attacks too.
Ryoku is best with fast moves, which is fine. However, his heavy and balanced moves are very easy to counter.