I don’t hate Calia as a character, I just hate her as a forsaken leader.
Narratively it’s awkward. She’s the sister of the guy who killed most of the people who make up the forsaken, and while I don’t think she should be looking at that as her legacy, I absolutely feel like the forsaken people should be.
While they are largely once-living Lordaeronians, they have also built a culture that scarcely resembles Lordaeron. While they might look at her as a figure of respect, it’s a hard square to circle to picture them just… Following her. Even as one part of the leadership council.
Because she just wasn’t there. When Arthas killed them, when Sylvanas rallied them, when the Alliance rejected them, when they marched on Icecrown, when Arthas fell, when Sylvanas rededicated them to a new purpose, when they raged across the north, when they joined the fight against Garrosh, when Legion sorta happened and they were there too, and when Sylvanas went full Banshee Queen across Azeroth. Calia was not there with them. She doesn’t have those shared experiences.
She isn’t of them. She was never Forsaken.
Because the Alliance did accept risen Calia. Anduin was still talking to her. The Alliance at-large hasn’t been shown to have a problem with her. She cannot understand the forsaken plight, because she not only never lived it, she had nothing but friends to guide her into a life of undeath.
And then there’s the physical differences.
Because Calia doesn’t even vaguely look like the forsaken. All the big faction leaders have unique models, but they are all very easily recognizable as a member of the race they represent.
Calia, like Sylvanas before her, is not that. She looks like a pallet-swapped human. If you stand her next to Jaina, the only thing you’d notice is that Calia really needs some sunlight for her complexion. You put Voss next to Jaina, and you instantly know they are nothing alike beyond the most basic levels.
And that’s without going into the coin-flip of Dark Lady vs Pale Lady titles, just to remind you Calia is not Sylvanas, in case everything else didn’t tell you already.
Calia is fine. Calia in a leadership position of the forsaken is less so.