I died as an lvl 70 Affl Lock w/ +1100 shadow and 9800 stam. I drew aggro away from my void and Tusker started pwning me.

Then I went ahead and took up a suggestion on wowiki to enslave an Elite Felguard (lvl 68) and used him to tank Tusker easily. Careful not to draw aggro away from the Felguard, and this fight would be cake. 5 times as easier w/ this strategy.