Plat Jungler, tried skarner a few times with limited success, a few things I found peculiar about this champ:
So Skarner as officially classified by Riot is a Juggernaut
Definition of a Juggernaut: Juggernauts are melee titans who relentlessly march down the opposition and devastate those foolish enough to get within their grasp. They are the only subclass who excel at both dealing and taking significant amounts of damage, but in turn they have a tough time closing in on targets due to their low range and extremely limited mobility.
If you look at all the champions in this list, they definitely have potential to both soak and deal damage and survive at low health by various means in their kit.
But Skarner barely fills this criteria doesn't he ? The W shield is underwhelming, He doesn't heal himself, He has barely any innate tankiness compared to other juggernauts and can't really soak damage.
Even building a sizeable amount of bonus health his W shield doesn't seem to get any big enough values to let him stay in a fight.
I would like to understand from Riot how Skarner fits the juggernaut title compared to all champions on this list, I understand he has much more CC than all of the other juggernauts and that is likely the reason why his damage is gated, but he needs a survival mechanic to be able to function more correctly IMHO.