does sion really need a buff?

Sion was the first champ i ever played about a year or 2 ago when i started. i havent played him much till just recently when people said he needed a buff. back then i wasnt to good so i didnt think he was good but now i know all there is to know and ive been playing him and i dont see why people say hes in a bad spot. his passive does take a bit of time to come back but that hasnt been much of a problem. ive laned against darius, riven and kennen recently and it wasnt a problem catching them and killing them in a couple basics. His Q does massive damage early game. His W is decent. i do think maybe the shield should be a bit more. The e is a good poke. and the R is ok unless you are going against someone who can dash like riven but you dont have to hit them directly for them to get stunned. just get close enough. i usually get dead mans so even if i dont hit them i can usually chase them down. I would love to see him get buffed since he is one of my favorite champions and i think he will definitely need it for S6 but i think right now he is okay. BTW i usually start dorans shield go to ravenous or titanic and then depending on the other teams comp defensive items