Aatrox is better than you think...
Like Udyr, Xin, and Warwick, Aatrox does very well in the jungle thanks to his sustain. However, because his abilities cost health and several of his abilities are skillshots (unlike the other 3 junglers), he definitely has a higher learning curve than other junglers, which leads people to think he is "weak" and needs a rework. Agree or disagree?
Also, I'm not saying jungling is the only thing Aatrox should do, but he seems to synergize well with the jungle items. He's finally found his niche.