True to an extent, false to an extent.
In Cataclysm, there were specific plot devices forcing the Horde to win when they would not have, and there were specific instances where the Alliance were portrayed to be sitting on their asses doing nothing.
This isn't the same as losing a battle or winning one, it's more presentation. Alliance was portrayed as weak and stupid, which is why there was such outrage in Cataclysm.
I don't think it will be the case this time as we have a better lore team in general, but I'm still wary.