Originally Posted by
Nynax
I believe her perspective is supposed to be extremely warped, intentionally, by the Jailer and that she is unaware of this manipulation. If I recall correctly, as far as Sylvanas knows, she believes that her soul was doomed for the Maw solely because of what the Lich King did to turn her into a banshee. That all of her actions in life and undeath ultimatly had no meaning because some external entity decided her fate for her based on some unforeseeable bias.
She has that perspective specifically because the few times she's had a glimpse into the Shadowlands the Jaile's minions were there to torment her soul so that she equates death with eternal suffering. Whatever events lead to her meeting the Jailer specifically, idk, but he evidently sold her a bill of goods "see how unfair this system those self righteous gods made is? See how they mistreated me too, just like you were mistreated? But if we work together, we can find justice for all!" I'd assume he doesn't really tell her the truth about the Arbiter, or that he is responsible for her Shadowlands experiences thus far.
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This too. Blizzard sold us on Sylvanas being a cunning and manipulative 4D chess player...and then had her being played like a fiddle with such a childish level of naivete.