Well, this is a fantasy game, so my opinion of such things doesn't really hold. The way I see it, good and evil are in the eye of the beholder. "I am me, and therefore you are evil" is how people tend to actually think.
So you command a legion of necromancers out in the blistering deserts, raising shambling dead minions to do your dirty work. The neighbouring town of upstanding and faithful citizens finds these acts distasteful, and so condemns the necromancers as evil.
Let's look at this from a different point of view. The necromancers are dignified and disciplined scholars who have tasked themselves with containing an ancient demon underneath the sands, since they are the only ones powerful enough (with their necromantic arts) to hold him chained. The walking dead are those members who have shuffled off the mortal coil, and with their dying breath know with pride that not even death will prevent their service to the living realm.
The neighbouring town, on the other hand, is stocked with people who would stab each other in the back if it meant their own gain, and fanatic zealots who preach raving lunacy to the crowd below, inciting them to attack and destroy the zealot's gods, whoever they may be.
At first glance, the line is clear between good and evil. Look closer, and you find that the line fades, blurs, and then vanishes. Both sides are good and evil in their own ways. It is only perception that defines morality.