When i am playing Renekton i find i really don't feel the same "Oomph" as when i play other champions.
When i hit enemy units with his Q it feels like i hit only the air, if some better "Unit hit" sounds could be added in that would be lovely.
But really overall all of his abilities sound like you hit the air, and not the target.
Are there any plans to change this?

I feel obliged to disagree entirely, though I've never played Renekton myself, I feel as though his sounds are scary epic.
A lot of bass, growl, it's pretty intimidating.

I have no problem with his voice or ultimate.