User blog comment:TheUnknown285/Things You Do and Don’t Want from ME4/@comment-11209678-20140613034158/@comment-4923296-20140618164834

I think the whole thing about morality in the series is that evil isn't necessarily a concept that exists for Shepard. Both Paragon and Renegade are choices of achieving the same goal. Renegade Shepard is just more brash and callous in how they achieve that goal, not necessarily that Paragon is easier to do or "offers" more if chosen. To be honest, this is exactly the reason I like the series so much.

To be honest, I think a more "evil" Shepard would be one who joined Saren near the end of the game ect.

What's interesting however is that sparing Rana Thanoptis in the first game means that she will end up indoctrinated in ME3 and kill a bunch of asari officials, so it's actually a better choice to kill her first off. These kind of choices pop up for me occasionally, I always feel that allowing Garrus to kill Sidonis is better as it allows him to sleep easier at night and move on, wheras Sidonis would never get arrested otherwise even if he tries himself.