I didn't hate it, I am a tad disappointed because I thought it would be someone we didn't expect lol.
Otherwise I'm fine with Vol'jin being warchief, I wish Vol'jin would of killed Varian when he stuck his sword in the ground. Then have horde kill off the Alliance there, now that would be epic. I still miss Garrosh though in all honesty, I guess now we just hold hands and kiss bunnies and rainbows will appear out of no where now lol.