Originally Posted by
Highdark
Slyvanas is a monster. We keep looking at her as a person when she is a undead creature. Everything she has done since being brought back is kill the living and raise them as undead. In war crimes this point is accentuated when she wants to kill her sister and her children because them being alive is inconvenient. At least while Arthas was alive she was a tool against him, but now she is the single greatest undead threat facing Azeroth. Voljin in his death state delirium appointed Arthas as warchief because the "spirits" told him too. Why Slyvanas is even allowed to exist mystifies me. She is dead, an abberation, a tormented soul trapped in her own rotting body.
Further the point, the Forsaken commit regular atrocities in the quests that they give. For example, In Western plague lands the player is tasked with going to the recently cleansed felstone field spreading the plague of undeath then slaughtering the farmers(not soldiers) raising them as undead to serve the Dark Lady. In the undead starting area players are lead to believe that they had a choice in serving the forsaken, but in felstone field it is clear that you will serve regardless.
Slyvanas's loyalty is only to herself. She betrayed Arthas, Garithos, Garrosh, her people(blood elves), sisters, the living, and lastly Varian and the alliance. Of course she had reason's but it doesn't make it any less of a betrayal.
Wherever Slyvanas and the forsaken go, the land dies and so do the living. She can be compared to Gul'dan and his fel magic in that sense. She needs to be treated like the monster that she is and have her soul put to rest like the entirety of the Forsaken.
All that being said I like her as a character : ).