You know, we actually ended up finding Lord Jaraxxus an awful lot harder than any of the other bosses we've tried. We've only really given the 10 man heroic one proper try to this point (raid week) and he was comfortably the worst.
There seems to simply be so much going on that our raid was struggling to keep up with everything. Funnily enough, for that reason, that's why I love it; it tests everyone and even one person underperforming is enough to mess it all up.
Some encounters are a DPS race.
Some encounters are a tank and spank.
Some encounters are a battle for survival.
Some encounters are a gear check.
This encounter distinguishes the men from the boys.
Unwavering Sentinel: Tales of a Protection Warrior Running Wild.