Right now Sion is counterplaying himself.
I take him (because I like big tanks) and then I hope the enemy is dumb and stays in my abilities.
That's all I can do.
Except that, I get hit and hope I farmed well enough to pass the test, otherwise bye bye.
And don't even think about dueling that zed, lb, adc, support, whatever with 10 hp, you won't ever hit them.
I just build auras on him, at least I know I'm doing something.
Of course playing with 300ms doesn't make things easier, but it's not the 300ms the problem here.
And god forbid the enemy has a Morgana. Than you basically are a big minion without attacks.