Right now, the difference between the campaigns is the scoring method.
BUT, what if they were different on their actual PvP' ?

Let's talk about the Battle Spirit effect you get in cyro. Right now, it grants 5k health, and a 50% debuff in damage and healing taken, shield strengh, and 8+ meters in range to abilities with range longer than 28. Not to mention battle leveling, wich merely ups your gear and counts as if you spent all stat points in health.
But what if each campaing had a different 'Battle Spirit' on it ?

Example,
Azura's Star would stay as it is,
TrueFlame gets an extra effect > "Whenever you receive damage greater than 75% of your max health, gain a shield damage for 15k and immunity to snare/stun for 4 seconds." - Basically, the campaing where all people being oneshot'd would go and rest at ease with their 64 points still being in stam/magicka.
Axe of Belharza would drop the effects of Max Distance, and damage/shield/healing debuffs. keeping only the health bonus. Where people can go and whack each other all they want.
Haderus would grant no Battle Spirit, whatsoever, keeping player's strenght, damage, shields, distance and other stats beside battle level unchanged. Gank Paradise, basically.
BlackWater Blade would have it's max distance removed. making it more newb friendly since not everyone will have snipe unlock'd.

So? Any decent?
I mean, it does sound tricky, but it also basically implies merely some tweaking in the battle spirit
and not only that, Zeni would also be able to monitor the player population and feedback from each campaing, to see what needs buffing or nerfing, IF anything proves to be actually overpowered or underpowered. * vampires being oneshot'd don't count, really.