Bit of trump attitude shining through there, garrosh didn't like any other race except his own.
The one thing the broken shore proved was no matter how good a fighter you are, it's pointless standing against an unending army like the legion, because you will die in the end no matter how long you stand, even broxigar died against the legions true forces. The only possible winners in this are those who find other strategies, like khadgar are trying, like Jaina should have tried to do with her ' get all out of dodge' card