The first game which was planed as a Warhammer game was about Bad Orcs vs Good Humans. After the second game and books Blizzard started to bend the story in favor of more realistic conflict. The "Good" and "Bad" are just an illusion, the core of every war is interest and power.
That being said i am not a fan of the new Horde. Vol'jin behaves like a child, Garrosh is a idiot, Baine is a too pacifistic and Sylvanas is just psycho. I did the Silverpine quests 2 times already and i still don't get why she needs more Forsaken???? They are former humans, who cares if they all die out because they can't have babies the Horde should just populate Lorderon with Blood elfs, Trolls and Orcs instead.
The whole: "These people come to resettle... lets kill them and make them zombies so they can resettle" crap is just stupid
At this point i would prefer if the Trolls leave the Horde and join their Zandalari Brothers