OT: I like the active mitigation style a lot, but then again myDK has been my main since wrath and just switched back to war tank for MoP. I do have to say though that there are A LOT of imbalances across all tank classes between self-healing, damage mitigation, and dps. I see DKs topping meters using their regular death strike spam, where I have to line up shield slams with Sblock or use rage to execute in the last 20% to get my numbers close. I also forsee the gap becoming bigger as pallies and monks focus on DPS stats for their active mitigation. From my logs, compared to my guild monk or druid for instance, I seem to take a lot less burst damage with properly timed Sbarrs and Sblocks on melee heavy fights.
I guess differences between tank classes are good, so that no one tank is better at ALL the fights...but still, I wish it was a little bit more balanced. Specially around dps and self healing.