Is this a viable build for pvm with psn sunder? Or will it be too slow?

Are there any druid pvm builds that are more viable now besides just nado?

nothing is "too" slow if you enjoy the playstyle...
but rabies will be pretty slow, since you have to hit each monster individually with no means of aoe dmg

Rabies is definitely viable

It does have AoE due to it spreading and not needing to hit everything

Crushing blow since your using melee kills bosses and the poison damage can prevent Ubers from healing.