I will say that the tank/healer dynamic has changed for all tanks. Tanks in general are squisher than they were in 3.0 and 2.0 and healers need time to get used to this fact its not just warrior that are having said issues persay. I can say after clearing susasano ex a warrior can easily main tank that boss without taxing the healer at all.

If anything I've noticed is warrior MIGHT be in the position to be the best main tank as their off tankiung capabilities were nerfed heavily while their main tanking abilities were buffed to high hell. Theory crafting will tell.