Both Southee and Boult are wicket takers .Most of the batsmans are also good all rounders .Have you seen the Anderson's game ? MCullum to bottom Vettori ,all of them are good batsmens.Majority of them are spectacular bowlers also.
Perhaps you might have seen the Vettori's catch during their match with WIndies .Martin Samules was just WTF !!
MCullum is truly blessed .He got a top notch team.
I will give them sure chance if the rival team is India.
But if it is Aussies then you cant predict.Aussies will put up their maximum during pressure condition..