This is a rhetorical question right?
It was obviously negative, as it asspulled Bob the Janitor into existence. He is apparently responsible for all the events that happened since at least the Human campaign of WC3 (the creation of the Plague is directly attributed to him by Bolvar Fordragon. So you thought Ner'zhul/Arthas were responsible for the Scourging of Lordaeron? Nope, it was the Janitor actually). It also has the negative of white-washing Suevanas Windrunner, the Forsaken, and the entire Horde for actual genocide (twice).
So this expansion has no problem white-washing Sylvanas and all the Forsaken because "oh they had their souls stolen!!!! poor guys!!!", but God forbid the Alliance kills like 10 people at Camp Taurajo or Jaina kills a bunch of elves
All in all this is just another Horde-biased expansion, with the added "Bonus" that it retconned the "behind the scenes" events of everything since WC3.