In the link from WoWInsider on the Firelands video was also some chatted about DK Tanking. If you’re a DK tank you should scan it.
My 2c: MAKE THE DEATHSTRIKE TIMER 12-13+ SECONDS. FFS.
The huge deal with DK tanking is that its hard to get right, and when done well is excellent. It is easy to do poorly, and be a pain for your group. Bring the player, just don’t bring an inexperienced player, or a player who has not done the fights before, or somebody who might not be perfect. Bring the player.
A key part of that is making sure you use Deathstrike at an optimal time. “Optimal” does not account for Movement, fire, interrupts, diseases, and all the other shit that you do while Tanking. Which means that often you have to use other abilities rather than DS.
Make the time that the false HP stay a little longer, and we have some flexibility. It’s not rocket science.