I’m sorry but musky is not a high tier class. Not for goblin runs and not for battlegrounds. The only reason its decent is in 1v1 in overworld or battleground and when groping up with a mage, scoundrel, or pally is musky and people in party can outlast the opposition, that is what made it top tier in oldbus, however now there are mages than can just delete anyone but pally in pvp which makes musketeer kind of bad in battlegrounds.
On goblin runs it can be powerful. Pally cannot kill musky or anyone partied with the musky very easily. Though in those cases the person attacking could just go mage and render your healing useless if they are good enough.
But even then it does not have the movement of pally or dps of mage to be high tier.
Pally is high tier due to increased survivability, decent damage if played right, and the best pvp movement in game. Pally is top tier in both battlegrounds for its ability to cap points very quickly with pally throwing to each point which helps win the game and is the best in world pvp for its ability to escape. You deal with pally quickly, kill them before they have a chance to pally throw away.
I do think that perhaps pally should have different damage reductions for each class to balance pvp against pally. As it stands right now you either need to be a top tier mage to kill a decent pally in pvp or get enough people to overwhelm said pally. (In which case they would pally throw away)
PVP does have its problems but I don’t think stuns would be the right answer.