Yeah but percentage of your damage and if your damages are pitiful, they aren't enough. And if you pump up your damage, your defense will go down.
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Oh yeah, that brilliant mechanic. 2 DKs on 4th boss in Icecrown could stack up huge shields between Taunts and invalidate a ton of damage from the fight. No thanks. You could also Death Strike up to 7 times in a row on a 1 - 1.5 second Global cooldown via Death Runes.
So no, I'd rather not be a Death knight clone. Tanking as a Death Knight devolved from careful Rune/Runic power management and cooldown usage judgement into {Spam Death Strike on one target, drop Death and Decay + Blood Boil spam on 2+}