What is Sions weakness?

Honestly, what is it? I've been trying to figure this out and it seems he is just too good all around. You can burst his shield but that usually costs you, even if you camp him, he's still useful as a tank with tons of cc, also he has ap, ad dmg and low cooldowns, how the hell should you play around this? I tried cho gath, garen and nasus, you just get bullied like hell.
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