I don't mind what Vol'jin says, but the Alliance response annoys me. Instead of saying "Yeah okay boss" they should be turning Vol'jin's ultimatum around on him.
"Oh, how about we let YOU Siege Orgrimmar on your own. See how well that goes, and then we'll come in and kill off the stragglers".
Obviously Vol'jin doesn't like the Alliance, and there still needs to be conflict between the two parties. What pisses me off is that the Alliance's role in this whole endeavour is just to join the Horde's rebellion.