Oh, it's very ambiguous. Horde players in particular are going to start out thinking "Garrosh Hellsceam is such an asshole, we want Thrall back." But you know, quest designers were really clever in the way they tell that story, and you end up kind of finding yourself saying "Gosh, I kind of respect Garrosh and what he's doing..." Orgrimmar has never looked better, and the Horde has kind of lived in this desert before - in the Barrens and Durotar - and didn't necessarily have ample food supply. He likes to look out for his people, and the orcs are riding a wave here and are pretty excited about it.
Then you see Garrosh in action a few times and you're like, "You know, he's not the jerk I thought he was, he's actually a pretty cool guy" So we're trying to throw in a little of that, and as I mentioned already, Sylvanas is a very charismatic character, and there's a lot of tension between her and the orcs. She's more or less on their side but as soon as they turn their backs, she's got a lot of machinations going on behind the scenes, too.