While it is true that his model doesn't have any outside healing, that doesn't mean it's not still a problem. Your own developers said DKs are balanced around 6 DS / min, or roughly one every 10 seconds. Three swings takes 3.6s starting from when the wow gold first one lands. A DK's shield is only going to absorb roughly 1 full hit, and the rest won't be covered except by avoidance. In a situation where avoidance is unfavorable, that DK tank is going to eat all three fully unmitigated swings. If you combine that in a situation where a healer has to move, which probably takes a second or so, by the time they start casting, the DK is done for. All of that can very easily happen in that 10s window.
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