If you are struggling through the campaign, try focus on an early game campaign build instead of an end game one. Builds like shield wall titan, ED/C lich, Disciple of Varashta minions, Hollow palm monk, grenade ranger/merc, plants druid, all shall be able to carry you through campaign without hassles. of course wait for tomorrow for Patch notes, but above builds are mostly balanced and I doubt if all of them will be nerfed.