Aatrox is super fun
I've been playing Aatrox support and I'm loving it. However I do think some changes would make him more enjoyable.
I was thinking of the following:
W (Damage mode): Basic attacks deal increased damage (tiny amount) in addition to the third basic proc. Also, when in damage mode E does increased damage and increases slow duration by 1 second.
W (Healing mode): In addition to heal with third basic, while in healing mode Aatrox's Q will heal depending on how many champs hit and where they are hit. Heal for as much as W third attack (in healing mode) when enemies are hit in the outter circle. When enemies are hit in the inner circle, heals for twice the amount.
Last but not least R: Aatrox will be able to revive at any time during the duration of his R no matter of the Blood Well amount.