I got this far, and then found out someone posted in here and has no clue what they are talking about. Jools, have you done a 25-man? I'm our guild's main discipline priest and trust me, if you ask my fellow guildies if they think I'm useless in a raid, you will not hear "yes" for an answer. Discipline priests do one thing that no other healing class or spec in the game does. Mitigate damage. Less damage = less healing required = more mana for a sustained fight. This lets your boomkin hog his Innervate for his own dps needs, even allows your healers to do a little extra damage on some fights (example: Thaddius). Just like most healing classes and specs, you don't need many of them. We only take two max, usually just one if we have our lone holy pally show up. But for MT healing discipline is far more useful than you think. Also, consider the additions you bring outside of that, primarily Power Infusion. Talented to 1.7 minute cooldown, this can boost a lucky caster's DPS by a far greater chunk than you would realize when cast at least two times (I say two because you generally get a Heroism somewhere, and the two don't stack, so you save it for afterwards). Additional added bonus is Pain Suppersion for fights such as Patchwerk, Maexxna, and Faerlina if you get a frenzy that can't be dispelled. Make a mental note. You should not comment about things until you see someone who knows what they are doing practice them first. Also, a disc priest who knows what to do can heal ANY heroic. I can heal Loken, which some deem a "holy only" fight. It's called Holy Nova. We have an AoE heal, and it does the job nicely.Originally Posted by Jools
As to the OP, your tank is bad if he is still having threat issues through shields. Plain and simple. I've done plenty of heroics with plenty of warrior and druid tanks and have not had issues with the ones that have skill. However, I have noticed a bug (and Blizz commented on it) where feral druids are still taking damage through shields. I have not seen if it's been fixed through maintenance or if it's waiting for 3.0.8 yet. A good tank won't mind a discipline priest.