I feel justification for Sylvanas’ actions doesn’t make sense at this point. Blizzard took her down a path where she cannot go back, and it didn’t start in this expansion, it was all planned.
I feel that she is a very likeable character, but as a villain, certainly not as Warchief. Imagine if Arthas would somehow be brought back to lead the Alliance, it would make no sense and most Alliance NPCs and players would not like it or agree with it.
There are players who like to be part of a more noble faction and there are also those who prefer to be under the leadership of a ruthless character. There’s nothing wrong with that. However we need to be given actual choices.
I don’t know if Blizzard has the balls to do it, but I would love it if they made an anti-hero faction. I’m pretty sure many of us would love to be able to join the actual dark side.
That way there will be no more complaints that the Horde should be less like this and more like that. No need to mix incompatible races anymore. I’m pretty sure that, objectively speaking, the Tauren have more things in common with the Night Elves than they do with the Goblins or the Forsaken(Cenarion Circle, anyone?).
If they go down this path at least for an expansion or two, it would be perfect. “The Lich Queen” is the continuation and development that Sylvanas deserves, if she is to go down then at least let her have Arthas’ treatment.
They could also just let her keep existing, since “there must always be a Lich King/Queen”. I would certainly not mind.
The point I’m trying to make is that the world and the factions need to be structured in a way that makes more sense and players should be able to choose who they want to side with.