That's subjective. This is my most ideal PvP:
-Soloable healers
-Tanks are hard to kill but they don't do damage
-Casters and healers use more normal casts than instant casts
-100-0 burst exists for all classes.
-No absurbly long cc chains
-Melee has enough gapclosers and cc breaks to fight ranged
-Ranged have enough escapes to fight melee
-1vX is possible for skilled players
-Every class has a high skill ceiling
Does legion hit any of those marks?