User blog comment:Ygrain/Seriously, Aria?!/@comment-2219564-20121226120816/@comment-24174486-20121227190557

Making Paragon choices encourages Aria to rule Omega with a more gentle fist, while Renegade choices reinforces her mercilessness. This also influences whether she spares or kills Petrovsky.

You'd think people would do more than one playthrough and make different choices before declaring that your choices don't have an impact.