A building-tall dragon empowered by the titans BEFORE N'Zoth ever got a hold of him. In the Cataclysm cinematic, there's no N'Zoth power there, that's all Deathwing doing the damage.
Yes, becoming the Lich King, who led an army of undead.Arthas? Powered by claiming Frostmourne and merging with Ner’zhul who was in tandem buffed up by The Jailer and Kil’jaeden.
Perhaps the most relevant examples. Both leaders of the Horde, so they could use the Horde's resources to further their goals (Faction conflict).That gave them an established force to be reckoned with, a motivation (beat the Alliance), and gave some connection to the player. In the case of Nightsquall, we're just pulling a fleet out of thin air, and what is Nightsquall's purpose? From the tales, it just seems like he wants to be rich. Pirates aren't known to want to conquer the world, they prefer to control sea lanes and raid people.Garrosh? Powered by by Y’Shaarj.
Sylvanas? The Jailer.
One of the most powerful mages to have ever lived, and a queen of an Elven empire. Corrupted by N'Zoth and turned into an undersea monster. Again, you're looking at an innately powerful character.Azshara? N’Zoth.
Same situation as Azshara.Kil’jaeden? Sargeras.
The point is that nothing in the tale of Nightsquall indicates that he's looking to conquer the world, or that he is even an evil character. What it says is that he's found some type of treasure and is recruiting other pirates to help him get it. It isn't a situation like The War where you have a clearly malevolent force doing something nefarious behind the scenes. Here it just seems like some greedy pirates looking to join this guy for a big payday.The list goes on and I can just continue?
There is evidence in game that Nightsquall is amassing the largest fleet the world has ever seen. There is evidence in game that he is seeking out power and magical artifacts for his own purpose. He has just as much presence and information in game as your Ultron styled threat. Of which, wouldn’t he fit your pre-conceived notion of being granted power to make him more interesting and powerful based off who created him?
I’m confused by your point.
Now, could Blizzard be making Nightsquall the major villain of the next expansion? Sure, anything is possible. However, something really seems missing from the concept.
Maybe it's motivation? Why is Nightsquall coming for the factions, or why do the factions need to stop Nightsquall?
- - - Updated - - -
I'm simply not convinced supernaturally powered pirates would be viewed as a viable threat. I've never seen media where pirates triggered an apocalypse. I have seen media where dragons, demons, kaiju, zombies, and robots have triggered the apocalypse though. That might be where the disconnect is coming from.