Weird, after switching to just running Icecrown 10 on a guild run after fooling around with Sarth 3D and wiping at 50k health, we downed Marrogar with 4 new folks who had never seen the fight. They were just so much better at killing the spikes, that we one-shotted him. It's amazing how much simpler a fight can be if you don't have a bunch of "BOSS DAMAGE UBER ALLES" crew. Got my friendly ring at least too.