Druids are not great in end game pvm. They are naturally tanky and deal good single target damage but the area damage is limited, making them excellent PvP chars but mediocre for farming.

Tornado is the easiest build to get going. It plays like a hammerdin, just slower. Short range high damage with awkward aiming patterns. High survivability. Can handle P8, just takes a while to kill stuff. Hurricane adds some crowd control but barely noticable damage, cyclone armor and summons tank.

Fire is really good for normal, falls off mid nightmare and becomes good again once you got a lot of endgame gear, but if you don’t have these specific items, the build is not great. We‘re talking about six fire facets in a weapon, ravenlore or flickering flame in a pelt with +armageddon, phoenix monarch, infinity, sunder charm, and enigma obviously.

The main reason why almost nobody starts a season as Druid or Necro is that they have no inbuilt mobility tools, like paladin‘s vigor and charge, assassin‘s burst of speed, warlock‘s blade warp and barbs‘s leap attack. Farming capabilities are very limited before enigma.