It was a major oversight by a development team to make a traditional DPS class as a tank. We have all seen these warning topics but now it's time to see the real results of this decision. Because people who waited and wanted it as a DPS role are playing it as such regardless of what SE thinks about the job now.
I heal DRKs every day and they are by far the most squishiest tanks I've ever seen. Why, most of them put all attribute points in Strength, use full set of Strength accessories and never use any defensive cooldowns. Often their HP drops low faster than I can heal through damage and they never help we with Living Dead and such to catch up, neglecting their tank and damage mitigation responsobilities. I have to babysit them every second or they will die, leaving me no time to help with DPS as is the case with properly geared and played tanks.