Humm. I find my paladin does crazy dps as a tank. In random heroics it is not uncommon for him to be top dps as the tank around 3-5k dps depending on how AOE heavy the instance is. In raids I have never been beaten by other tanks and on occasions even beat out the slacker dps on boss fights. Trash pulls and my paladin owns. With the icc buff in place I have hit over 16k dps on trash in ICC as a tank.