Sion is a better bully than Darius because he can harass safely, sort of like a ranged champ...
Have you played against Sion in lane?
Have you played against a Sion in lane who maxes his E first?
It is one of the most HORRIBLE things to play against as it gives little interaction when playing against him besides dodging the minions.
Darius, Renekton, Garen, and many more have the role of bullying champions, mainly melee(Renekton can get on ranged better than the other 2) but Sion is able to harass melee AND ranged with just his E on a minion to hit the champ.
And he will do this over
And over
And over again until you're low enough to die to a gank.
I'm not saying increase the mana cost(already had that happen) but to nerf his E and buff his Q or his R instead, this playstyle of "poke Sion" does NOT fit his theme.
He died going balls deep in a fight, not because he kept roaring soldiers at the enemy till they were low enough to fight with little risk of death.
Is he a huge problem right now? No but he will be when people figure this shit out.
Now I'm all for Sion shitting on ranged champions in the top lane, makes me feel glad they actually take damage for going into a lane they thought would be easy.
But for him to shit on melee and ranged with little to fight back as both(unless you're Irelia) is not fun at all.
Please nerf his E and buff his Q/R(or the correct term, "shift his power please")