I wanted to point some things out and make some suggestions to improve your survivability and threat for our heroic raids. I know it can be depressing to die a bunch and have people btching in vent, try not take it personally and just do what you can to be the best tank possible.
I got some input from people on TankSpot about your stats/spec/etc and although your gear is good your spec could use some work and possibly your rotation as well. From your armory people said that your spec looked to be more utility/PvP oriented and was missing some important threat talents for PvE.
The best way to improve is to take the time to do some theory crafting outside of raids and utilize the knowledge of other experienced DK tanks to min/max your spec/rotation/gear/enchants/gems and then put it to use and see what works best for you. I got some info that I wanted to pass along, this is considered one of the definitive Blood DK Tanking thread: http://www.tankspot.com/forums/f14/5...d-tanking.html
Although it has a wealth of good information you can probably save time by focusing on the summary in Appendix 6 where he lays out what he personally uses in a synopsis of a good survivability/threat combination (post #7 - http://www.tankspot.com/forums/f14/5...tml#post273332
Here are some highlights from that appendix 6:
52/8/11 Talent Calculator - World of Warcraft
Blood DKs are ideal for single target tanking with the most active availability of cooldowns, self heals and threat to work best in end-game PvE when used efficiently. With all the self heals and talents available to you it is a night and day difference in survivability when using everything available to you at the right times. It requires a synergy between spec/gear/rotation that can produce impressive results in both survivability and threat when combined efficiently or fail when not used correctly. Although less damage may be taken when Frost or Unholy, Blood is the recommended spec because fast reaction time in the correct use of self heals makes your damage intake seem like less to healers and is ideal for fights like Gormok.
The days of OP DK's are over, they are now on par with Prot Warrior survivability/threat and require more knowledge/effort to play effectively then the current flavor of the month OP classes (Pally / Druid - though Druids have been #2 OP tank for multiple patches now lawl).
Update with additional DK impressions on threat:
- You REALLY need to be using Rune Strike more frequently, it is a HUGE amount of threat.
- Here is a macro you could use:
#showtooltip Heart Strike
/cast !Rune Strike
/cast Heart Strike
- With the mentioned respec and improved use of Rune Strike they think you would have a night and day difference in your threat output
- Here is a quote on Rune Strike:
"Rune Strike = this semi-passive tool is a major threat player for all DK’s and very easy to use without requiring active attention. There is also no better use of Runic Power available for threat, so it is well worth it to macro this into your other primary abilities and make sure it is used at every available opportunity."