From the latest wowhead interview:

As the interview progresses, one can start to sense parallels to the most-extreme fan reactions to the Burning of Teldrassil, with the discussion explicitly moving towards WoW around the 30 minute mark. We're reminded that story arcs are started years in advance, and raking one employee over the coals, like Christie Golden, is unfair and unjust. Big decisions like Teldrassil are made way in advance by the game team, only later brought to members of the story team to dramatize the plot, not to actually create the plot.

Overall, Metzen doesn't shy away from stern language, expressing embarassment for the behavior of the nerd community. He's concerned with the community's mentality to throw stones online, and worries that some players cannot differentiate between being mad at an upsetting character within a work of fiction, and being mad at creators tasked to bring a story to life. He also pointed out the hypocrisy of people losing their minds over Teldrassil, completely writing the story off, and then a few days later gushing about how Saurfang's cinematic and story are absolutely perfect.

Given how many people all angry and shouting "bad writing" at Blizzard while attacking Christie Golden on twitter, Metzen's words ring true.

No, your idea of how the story "should" have played out is not valid.

Yes, you should consider that maybe, just maybe, you're being toxic and terrible.

And if you aren't a fan of something anymore, consider that perhaps it is not for you anymore.