Wrath of King Casual.
Now, on second expansionpack many of the vanilla-players stopped. Most likely because the game was too easy, 'all been seen' or after 5 years it was time to move on.
It seems like Blizzards intentions with this game was slowly fading away. They weren't as focused on making the game challenging, more focused on keeping their casual players and feeding them with an endless amount of easy obtainable epic items and many pretty cool things, that could be bought from vendors.
Their 'amazing, overhyped, cool' deathknight also joined in when WOTLK hit the release and they just had TOO much focus on this class and were completely blind on balancing the PVP side, and still, deathknights are chopping their way around at high ratings and Blizzard remains completely blind to it.
And now with rumors and promises about your 'change-faction-for-money' options it just hit the extreme rock bottom.
They are, just like EA, a moneymachine when talking about WOTLK.
Blizzard just lost everything when Wrath of the Lich King was here. Sadly.