Aatrox needs some love I think.
Realistically I think his overall rework design was in the right direction. Removing his free level 1 GA was important (it was either cheese early or irrelevant late), but as we've seen, even sticking it to his Ultimate just didn't work out.
The first, simpler idea is to increase his base Q damage early, and maybe a bit at full rank. This will help his early game get going faster, because he doesn't really seem to deal a lot of damage until rank 3.
Another more obscure idea is to add a slow to his non-knockup Q zones, so that he has more AOE effects for team fights. If necessary, reduce the slow on his W so that the slow zones may not be enough to keep them in. Alternatively, his W zone also slows other champions by half that of the tethered champion.
Just a few quick ideas to try and help him. He seems like he doesn't get started early, so he can easily be shoved aside and denied his mid game prominence.