Ok so we always consider that we are on the side of good in this game yes, fighting to prevent the world being destroyed yada yada yada....however have you ever considered how other races might see us?
Take the murlocs! to them we are deathwing! many times over! we come there and kill them by the hundreds...slaughter the young etc etc simply to take some fins for a deranged villager somewhere who wants to sow a murloc fin blanket for his horse.............same with the boars, there is a legend among goretusks of a dark man.....a man who comes and rips your liver from your body stuffing it in his bag dripping of blood!
so yes good/evil? just perception I think. I know what titan is going to be as well........a new mmo still set in azeroth but from the point of view of the critters/low level mobs, and WE will be the evil power. :P