I played an ARAM with Nami a few days ago. First time playing her ever btw. I just built her straight AP and ROLLED! She's quite powerful.
As far as Aatrox is concerned..... I hate him right now. I went Kayle (one of my mains) top against him and got crushed. His sustain is high and his damage output is also. So hard to duel against right now. I thought I would have a good shot with Kayle's ability to poke and farm from a distance, but I just got jumped on, knocked up, and half healthed.