Watch Him Die: Poison and disease cleanse totems are helpful. Kill the adds but not the watchers. There's a trick with the ledge although I'm not sure if this would be considered an exploit - http://www.wowhead.com/?achievement=2036
The way I did it is by having the tank body pull, have an earth elemental up at the corner before the room and have the healer heal and take aggro of all adds and run to entrance. tank and 3 dps nuke boss, and tada


Gotta Go is rather hard atm, requires a warlock and a 4dps/1tank group before the patch, should be very doable now.


Less Rabi requires a mage, imo, to take the third transformation.