I don't think so.
So if a unit of three Ogryn lose one model they would have to take a test. So that test would be d6+1. Which means if you rolled a 6 you would end up with a 7. So if Ogryn are leadership 6, they would lose a model. If they are leadership 7+ they wouldn't lose anything. I don't know what leadership Ogryn are since I don't play guard, but if they are akin to Orks, the schmoes would have a leadership of 6, and the Sergeant would have a 7.
So in your BRUTAL scenario, the unit of Ogryn would have to lose their sergeant as a casualty, and then they have a 1 in 6 chance of losing an additional model.
So it's not that bad. I mean right now, you are rolling 2d6 against a leadership of 6 or 7 and risking them running off the board.
And we still don't know what effects rules like Stubborn have. And we don't know more things like Commissars, or other HQ units are going to have on the army.
until