Originally Posted by
Qualia
Not really, you seems to have quite a few misunderstanding in regards to lore.
Firstly, Azeroth is supposed to be the most powerful Titan / being in the universe based on Chronicle. Although that was before FelSargeras appeared, with that said Azeroth's power can be as high as Blizzard want it to be. At very least, she is supposedly more powerful than Sargeras before affected by Fel, and she is powerful enough that Archimonde thought that by draining the power of the second Well of Eternity and the World Tree (which in sum weren't even entire Azeroth's power), his power would have been able to rival that of Sargeras. In other words, a part of Azeroth's power was supposedly strong enough to turn someone who was the equivalent of an ant to Sargeras into a being rival him. Think about it.
Secondly, the Pantheon never got one shot'd by Sargeras. Why is this keep being repeated here and then? The only one who was one-shot'd was Aggramar, and it wasn't because he was much weaker than Sargeras - it was because he naively approached Sargeras defenselessly trying to talk. Sargeras outmatched Aggramar, but not to the extend that he could have one-shot'd him in a fair fight as their previous battle showed. The rest of the Pantheon were never one shot'd by Sargeras' Fel Storm either. They fought Sargeras long enough that their battle destroyed most of the Legion and many stars. Sargeras gradually weakened the Pantheon with fel, before finishing them with the Fel Storm. We don't call that one-shotting, as one shotting implying finishing the fight with, well, one shot - it wasn't the case with the Pantheon.
Thirdly, lore-wise, the power of the Naaru while not being among the top hitters, is still pretty high up there. A'dal, for example, was supposed to be able to destroy cities and mountains at will. Xe'ra rescued Illidan from magic of Kil'Jaeden seemingly effortlessly, and were many times more powerful than A'dal as Illidan observed. T'uure sacrificed itself and created a massive holy nova covering an entire planet, removed all void corruption and banished Dimensius. They not doing anything significant in-game doesn't mean they are weak (lore-wise) as PiS is pretty much a thing (otherwise, Archimonde would have destroyed Draenor the moment he stepped there). Of course, they are not anywhere near significant to Sargeras, but any little bit help.
Now consider this: in the best case, we have Azeroth (whose power should / could rival Sargeras if Blizzard want to), the Pantheon (who are only a bit below Sargeras and significantly above anything else in-game) and the Naaru - all those beings one way or another empower us and our artifacts (temporarily, of course, since we can't be so brokenly powerful all the time). Throw in an Argus exploding and unleashing all its Fel power on his face as well. Do you still think we can't match Sargeras? Yes, Sargeras is god-like powerful. However, so what? That doesn't mean he can't be defeated - we just need to become gods ourselves. It's far from impossible, although I'd prefer it to be a quest chain much longer and grander than something constrained in two patches. Us defeating Sargeras in his full might might not be done, but it isn't something that can't be done with current lore.
Lastly, the Void Lords' powers are still a big "?" at the moment. There is no indication that they were or are more powerful than Sargeras. We knew from Chronicle that they were envious of the Titans' power. Additionally, the most powerful among them manifested in our universe. Sargeras found them out, realized they were way more powerful than the demons and were concerned about the meaning of their existences, but he never bothered to stop his war with demons and just decided that he'd face the Void Lords after that. In comparison to his reaction when he found out that the power of the Void can corrupt and give birth to the Void Titan (immediately stop his war and summoned the Pantheon), it doesn't seem like Sargeras were that much afraid of the strength of those most powerful ones among the Void Lords, and more about their dark, corruptive nature instead. Although, I'd give the Void Lords the benefit of doubt and put them as a "?" as they are the big bad at the moment, and they haven't been shown much in game or novels so there are still rooms for Blizzard to make them more powerful than their description in Chronicle.