I finished Silverpine Forest with my warlock this weekend. The story was quite good. I particularly enjoyed listening to Sylvanas early in the zone as she recounts the history of the Forsaken. There was nothing I didn’t already know, but it was an incredibly powerful speech that really gives a great idea of who the Forsaken are. Here’s a great video of the quest I found.
Simply amazing storytelling.
I know that a lot of people seem to think the end of the zone contains the great story moment, and yes, that was cool too. (I won’t say what happens.) But it didn’t compare to this speech.
earthwormgem
Peter (Devee)
Kor'kron 501st 
I think some of WoW’s most interesting and strongest storytelling is with the Forsaken zones. Silverpine was wonderful, and Hillsbrad continues the awesomeness.
It’s a shame that sort of sweet storytelling isn’t replicated elsewhere in the game. I mean, they tried, but the Forsaken are so… not-stereotypical that Sylvanas could be using an outhouse and it would be interesting.
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