People complained when there were no 'war' in Warcraft.
Now they complain when the leaders are actually showing some attitude towards the other factions, what do you people want?
All the current Horde leaders to turn neutral, and then they make new "alliance-hating-leaders"?
Jeez, Vol'jin is looking after his people/faction, of course he's not going to cuddle talk with the alliance.
EDIT:
The difference between Garrosh and Vol'jin as a potential Warchief is that Vol'jin will not be a racist towards the other races within the horde.
He know how the Horde was built up and is not going to let it fall apart like Garrosh is now doing.