Warlocks, spriests, arcane mages, and ele shamans gain or break even on single target dps by multidotting (shadowburn or havoc + incinerate/immolate=multidotting imo). But otherwise you're right, no need to kill them if you don't have enough *useful* multidotting to get them down in a timely fashion. You can just drop them in convenient places around the room and move out. You can actually put 3 of the 4 in phase 2 against one wall while not moving the boss. In our group, we kill three of the four Phase 2A desecrates using just multidotting with ele shaman + arcane Mage + 1 or 2 warlocks.
Also, if your melee are running out for whirls, they could be losing a bunch of dps. Try to keep them on the boss all the time.
Last edited by Mini; 2014-03-13 at 10:09 PM.
Minimerlinx - Kel'Thuzad (US)
<Royal Militia> - 14/14H, US22 10m, is now recruiting all classes for WoD! Apply here!