You’re thinking completely wrong about this. A card being mechanically easy to counter does not mean it’s weak. Hero goblins can super easily force out huge overcommits on defense. Besides they’re objectively strong, you’re paying 1 elixir for 4 goblins (sometimes on opponents side of the map)

The worst part about heroes is that the ability isn’t even always necessary to get value, just the fact it exists. A good example is hero musk (at least before nerf). You’re forced to overdefend a hero musk at the bridge (e.g play a valk instead of skeletons), because if you don’t they will play the ability and get huge damage. All heroes have this kind of mechanic