I seem to be having a hard time with AoE tanking and maintaining threat on multiple trash mobs in some Heroic instances. I feel that my lack of threat gen could be either my gear or my rotation. I am not yet raiding, and have just started attempts at the more challenging Heroic instances. I am wondering if there are any gaping holes in my gear that would be causing my hard time with AoE tanking and threat gen on multiple trash mobs. Thanks
Gear looks fine for starting heroics. I would get rid of all of your Parry/Stamina gems though. They're just a waste of itemization... go with Dodge or Expertise.
If you're struggling with multiple mobs, you're probably soloing using Shockwave and Thunder Clap to tank them. You've gotta do both of those as well as tab through them all and hit them with Shield Slams, Revenges and Concussion Blows whenever possible. Remember Devastate is your lowest threat move, so if you're spamming it, you're probably not even close to doing the threat you are capable of. Also, if you've got excess rage, you should be Cleaving whenever possible.