Not really.
I've mained Hecarim for a year and a half.
Tank champs counter Hecarim, because when my predator is used up, if the enemy isn't dead, its risky for me to drag on a fight.
Other Champs with invulnerability or untargetability, like Yi during Q, Zed ulting, Fiora doing that parry stuff, Kyle ulting, Taric ulting, Fizz pole jump, and Kayn going invisible and landing on you... They all waste your E dash and drastically lower your dashing hit damage. Tanks, also single-handedly survive the one shot with stats alone.
You counter Hecarim with the above. If he gets nerfs, then that's not fair. His damage comes from these stupid runes reforged, not his kit, and when they nerf damage in the rune pages and buff tank stats, any Hecarim nerfs they do now will gutter him in the future. EVERYBODY is 1 shotting people right now, not just Hecarim, and it's the runes' fault. (also item balance causes it too)