Right about that, not right about blaming the healer. That is like saying well your rotation is wrong, but no problem blame that healer. It may very well be the healers fault, but I don't know that, more likely it is the group is largely inexperienced with their class, role and/or instances and still need to some work.
Well, that wasn't his rotation
And i said "PROBABLY" about the healer
But his stats seem right and that boss doesn't ask anything special about tanking, just keep him and stay out of the circles. As a shadow, he cannot do anything more than "keep the debuffs and auto-heal when he has 3 charges" and "Deflexion if he's low".