The bias for Sylvanas is so strong it's ridiculous.
She's evil. She's consistently been evil ever since Arthas made her what she is.
In Gilneas she killed Genn's son just to spite the worgen, she outright lied to the horde emissary, she disobeyed the orders of Garrosh, her Warchief, and bombed Gilneas with the Plague.
Yet Genn and Jaina get the most crap. They are right though and justified in their actions. The alliance is screwed either way. What good will it be if we defeat the Legion only to go under yet again, just this time it will be to a dark lady instead of a dark lord.
She's hot though, I guess that excuses all her actions.