As it is currently, there is absolutely no reason to use any composition of classes besides 4 marauders for HM operations. Not only is their dps excellent, but with 4 mara's the group can roll "constant" bloodlust to maintain max group dps. The best solution is to put bloodlust on a global cool down for the group analogous to battle rez.
Oh My Goodness! Why, the fact that my raid group is clearing HM S&V without Marauders or Sentinels must be some kind of mistake! We'll delete our toons and re-level from scratch immediately
Thank you SO VERY MUCH for bringing this to our attention!