Originally Posted by
IxilaFA
Taking the lore aspect that Sargeras is one of the single most powerful creatures in the entire universe? I don't think that's too much of a stretch. Getting a buff from the aspects to defeat Deathwing is one thing, since the Aspects and Deathwing are on the same level of power. Defeating a Titan, ie, the ones who gave the Aspects their power? That's a whole different story.
Granted I am willing to suspend disbelief with stuff like the Lich King and say yeah, maybe we could reasonably defeat them (even then, we would have died if not for Tyrion), but it's a little hard to suspend disbelief when you're talking about one of the most powerful creatures ever thought of being defeated by a bunch of mortals.
The Naaru shouldn't be involved either. If the Naaru were capable of defeating Sargeras and the Legion, they could just do it on their own. They don't need to give divine buffs to a bunch of mortals to achieve that. The entire concept of "divine being gives us divine power to defeat evil god that the divine being could have killed in the first place" is terrible. I don't put it beyond Blizzard to fall back on that, but it's a poor concept and doesn't make much sense.