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!
It's not the point that you can't clear content without maras. The point is groups are rewarded for bringing 4 of the same exact class and there is nothing to discourage them.
And some of the above posts are very wrong, bloodthirst is a 15% increase to dps and healing for 15 seconds with a 5 min cooldown. I also specified operations which has 8 people, presumably 2 tanks, 2 healers, 4 dps.