When I see some people still arguing Sylvannas isn't evil and despicable I don't know if they are master trolls or have very shaky moral standards.

This reminds me what a friend of mine said: as long as the villain is hot, some people try to justify his actions. 

Personally, when Sylvannas turned that random elf warrior head to the side so she could watch Teldrasil burn she crossed all the lines. It was petty villainy against a beaten foe far below her weight class.

But hey, she is hot so she probably had her reasons.