I’ve been trying out a Storm / Air build and I found Tornado to be ok-ish, but it has 1 flaw and 1 bug (I think)
Flaw - too random. Don’t take me wrong, random isn’t bad as such, but it would be nice, if the Tornado at least went through the point you clicked on once on its way. It’s way too unreliable as a ranged attack otherwise.
Bug (I think) - If you have an enemy cornered and pinned against a wall, and you stand face-to-face with him, and cast Tornado, it does nothing. Your spirit is gone, but the Tornado either deoes not appear, or does no damage to the enemy in queastion.
I think there’s a legendary power that makes it home in on monsters
Oh, in that case, I withdraw my “randomness” comment.
As for the second part - I think I missrepresented it a bit - the Tornado spawns generaly a bit too far and can completely miss ALL enemies that are too close, no only those near a wall.
Yeah when you get the power it will home back again. Should part of the base spell tbh. I played the same spec as you on my druid before I tried another class. I know what you mean, every time I cast it I’d hold breath a little trying to steer it with mental powers like when you was a kid playing sonic 
i am currently trying to max on that skill with my buuld.
generally there are very few cool combinations that you can use to make it useful, as dahako mentioned, without the homing legendary its annoying.
i personally play with the storm basic skill and with damage to distant enemies - if you use it from distance with the homing legendary, the tornados mostly hit the enemies. it always slightly curves when you use the skill, so you will have to get used to it.
But yea, its generally a slow build, because you’ll have to ramp up those tornados first. it helps to pick up nodes that give you back spirit. but obviously - a 1 shot werebear with 20 different fitting leggos just seems to be designed to be way stronger than tornado. i think they should give tornado more love
The only real ‘bug’ with the skill is the issue that the tornado doesnt spawn at all if there are objects in the way at the wrong spot.
I have that aspect and still run into the same issue they are having