I find that video games - and fiction in general - are getting much more brood about "good vs. evil"
In, say, Lord of the Rings, it's very clear who is good and who is evil - made perfectly clear by the Witch King's love for people getting their flesh eaten. (Although, I'm not perfectly sure he has that fetish in the books - been a while since I read them.)
However, in the Warcraft lore, it's much more difficult. Much more difficult to tell who is on which side. Much more gray/gray, than black/white.
League of Legends, I think, falls nicely in the middle. Yes, at first glance Demacia seems to be the "white" city and Noxus seems to be the "black" city - considering folks like Sion and Urgot, Noxus may very well be the evil city, but Demacia, I think, is much more gray than they would want people to believe...