Almost feels like DBZ with the power creep. First time Goku faces Frieza? A world is destroyed and he barely survives after unlocking the most powerful form of Saiyan. Next time? Lol Gohan punches him through the chest, killing him, without even powering into SS1. Or Trunks going SS1, obliterating Frieza and then slaughtering King Cold.
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I could see that. But you do need to keep in mind the Broken Shore isn't a few hours away. Sure, in game we're close, but in an actual time line, it's around 7-10 days between the legion first landing and us stepping foot on the shoreline. Getting to Northrend isn't a quick jaunt, going from SW to Borean Tundra is like a month or something.
With that understanding, a minor beachhead could transform into a major entrenched encampment, especially since the Legion use the Nether to get to Azeroth, instead of having to physically travel.