So with my Frost DK, I finaly got up to this quest.
And boooyyy... Im considering this as almost imposible for me.
Seriously, couldn't even get Wrathion down to 50% hp. Its those damn Tear Blobs, I swear, I just got hammered by them.
I could manage to adjust and avoid everything else with some effort, but those Tears just have way too much Hp... seriously. I try and kite them as much as I can, but I just end up taking too long to kill them and Wrathion would go into his Mirrior Images, and I would get killed because I cant kill the Tears and the Images at once.
So after 13 tries, and many searching, I gave up and decided to do the Tank Challenge with my Offspec Tanking Gear.
Funny thing was, completed the Tank Challenge, first try. Most of my Tank gear was lfr 502, compared to my dps gear, which is almost full 522 (also upgraded) gear. Tanking Challenge is a walk in the park to the Dps Challenge.
I look at as much strategy on the dps challenge as I could, by those tears is the only thing that forces you to have better gear or a high amount of dps to kill. Also the fact that I won the Tank Challenge first try, by simply using my aggro abilities and Death Strike. This is why I think it needs to be nerfed.