i've run CM loads of times to get the armour and although its a challenge its really not as hard as some of ther others,
just have a close range and long range setup, and target 1 person and attack while someone uses aoe to damage/distract others so you don't get swarmed. also been sneaky helps (really don't have to do non win fights)
The first time through any dungeon I found it difficult, but on latter attempts at higher lvls (and with better skills lol) they weren't nearly as challenging. One of the most important things to do in dungeons is to NOT run in. So many times I'm with people and they just run in and start fighting 4 mobs at once and they die and I do not try and help them. You may think me bad or mean for doing not helping, but its stupid to run in. Learn to pull, I have yet to be in a dungeon where you can't pull mobs. Even if you pull more than one you can easily let the others go by moving out of aggro range and not attacking them and Dazeing/stunning the one you do want so instead of reseting to its normal point it will reaggro you.