I have been thinking about Rotface and hes achievement and how a proper tactic could be to Dance with the Oozes. I think you can do it like this.

You need

1 Tank

1 Kiter (Hunter if possible)

2 Healers

6 DPS

The point behind this tactic is to have the tank in the middle with rotface and everyone gathered up behind him, including healers. When rotface turn around and dues he's Slime Spray someone will get Mutated Infection witch will spawn an add. The first one will healer be able to heal you, when the second spawn you have to merg them and start the kiting just like the normal tactic, the trick now is when the third one is going to spawn you will still stay in melee and healers will heal you for all the little damage it will do to you, when the forth spawn you will merg them together and have the hunter use Distacting Shot to get it to the other Big Ooze that he allready is kiting so they can marge together, this should only give you one stack and not two. When the big Ooze are on 4 stacks you shoulden't merge any more of the small ooze together, let the small adds hit you insteed in melee and healers will probebly be able to get you to max health anyway. By now, you should have killed him or els you have to figure out another way to do it

-Over and out, Shinoda