Healer : I played only sch but what its what i fell about healing :
Frontline is a mess without aoe.
But i think its balanced more for 4vs4 than frontline, it fell easier to heal in 4vs4 because you cast fast, but when you get zerg by tank and both dps, its harder to survive now, also you loose attune, it fell like nothing can save you from this.
Broil on sch is too much OP when a kill happen and there less pressure to healing.

Dps : din't try enough dps yet. summoner is good but i din't try other ranged yet
Sorry for my bad english.