Ok, ok here comes a bit of Warcraft Physics into play.
Sylvanas is a very powerful undead being, so getting hit by a worgen should not be very hard on her.
I mean humans can deflect Orc blows, its not that farfetched. Power and durability is more like on super hero level than "normal".
May i remind you he took a poisened arrow in the chest (maybe she should have aimed at the knee?) and last i know hes pretty ok. Correct me here if im wrong.
On topic:
In general im still interestet but yeah, the Alliance/Horde conflict is the biggest fuck up. It hinders good storytelling since vanilla.
Also its absolutely against the build up of every addon wich is won by working together over the factions.
Like someone said its a jacket old and worn and three numbers to small yet we still wear it.