Your gear isn't that bad, and plenty capable of doing 5-man Heroics, but you're missing pretty much all of the base tanking talents, as Zed said. Pick those up, and your survivability should be much better.
As far as threat, make sure you put your Death and Decay down, especially on AoE pulls. It is, by far, the best opener for packs of multiple mobs, and very good for single pulls. After Death and Decay is down, try to get an Icy Touch -> Pestilence -> Howling blast as soon as possible. Blood Tap if it's on cooldown to get the Howling Blast, or just wait for the runes to be available.
If you're still having issues becuase DnD isn't up often enough, pick up Morbidity.
Last edited by ttocs; 03-23-2009 at 10:35 AM.
Luck is what happens when preparation meets opportunity. -Seneca
Everyone marvels at a square egg, but only the chicken understands the PAIN.