What class is good at dealing with multiple enemies (in battlegrounds)?
Windwalker, just like any other melee in the game, are terrible at dealing with multiple enemies in pvp. Take Frost Mage for example. Frost mages have the toolkit for dealing with multiple enemies in pvp, in battlegrounds. What other class? Hunters? Maybe. Frost DK? Maybe, with their howling blasts and talent chillblains.
I think Frost Mages are pretty much the only ones who can deal with multiple enemies in pvp.