The commander packs are definitely difficult. we tried several approaches including a hunter droping a trap at just the right spot to catch the commander. that sort of worked but we kept having gaps that let him get spells off. We found the best approach was to have a druid stealth up and hibernate him then run like hell toward the raid. Stealth is not strictly needed but it helps if your not sure of aggro radius. That druid can just keep the guy hibernated the whole time while the tank picks the mobs up well away from the commander to avoid acicdental breakage. Repentance also works on him if you have a ret pally.
For 10 man we used 2 ranged inside on P3 instead and told them to stay far enough apart that they wouldnt blast eachother if debuffed. This let us use a single raid healer in there to keep them and the tank up and just dispell as soon as the debuff landed and not have to try and confirm they were in a safe spot. We had an aflic lock and a hunter as those two ranged so mobility was less of an issue. 25 was a bit more dicey as there seemed to always be someone that either wouldn't move or lagged at a bad time.

