The whole spirit of Warcraft stems from a divergence from the Tolkien paradigm of Humans good Orcs bad. In Warcraft there are good and bad of both. If the loremasters of the game stay true to that original purpose, I see no reason why that wouldn't carry through to the cosmic forces. "The Void" isn't good or bad because it's just a power source that is wielded by many users. And each user has a different shade of morality.
Even if entire organizational structure that represent that force, like Fel, are corrupted (The Burning Legion), we still see Fel users (player Warlocks, Illidan) who use that magic with arguably good and bad intentions.