First, some background. I'm in all blues except for a single epic, and unbuffed, except in tree, I have about 1330 SP, 15k mana, and 580/200-ish regen. I started healing heroics at around 1050 SP and in blues from the regular instances, and my first heroics were UP, UK, CoT, AN, and...one more I don't remember. We did them all in a row, and had hardly any troubles (it was with the first group I talk about below). In fact, we pretty much steamrolled through them. I've since healed most of the heroics minus the two Ulduars and Gundrak, having little trouble unless the tank blew or dps wasn't good enough. (I healed a pally with 460-ish defense and...I forgot how much, but not very much HP...through a heroic D'TK, which was rough, but fine once we got a rhythm down)
I've attempted two timed CoT runs. First time was with a group where our DK tank was in almost all blues, and our dps were: one in mostly blues and two in some epics (about half, I suppose). It was the first time trying a timed for all of us, so none of us knew where the special boss was, but we zoomed through and downed Mal'Ganis with a bit over a minute left, meaning we could've downed the drake boss had we known where he was.
2nd time, we wiped once, and had we hustled, we could've made it. We were short by a few minutes, but that was only because we didn't think we could make it after wiping. When we realized we could've, it was too late.
Now, this time, I was in a group, and it would've been a great group. But
1) The DK tank had never been there. He didn't really make any mistakes, but we probably lost a couple minutes from not hustling from one spot to the next as fast as we were capable of.
2) The mage would (I think unknowningly (e.g. no meters)) pull aggro on occasion
3) For speeds sake and to save me once, the ret pally would end up pulling aggro.
We wiped twice. Once because we had just downed Meatlame and were running to a more central location when the next group spawned on top of me, and the second at the 3rd boss when the DK said to stop dps. Reason? So we didn't get aggro. He did Army of the Dead. Correct me if I'm wrong, but I'm pretty sure they don't taunt or attack friendly characters. Anyway, in my confusion, I die, but the DK and pally manage to down him. We ran out of time at the beginning of the alley after the bookshelf.
Few things I did wrong: Ran back after the first wipe instead of porting (didn't know the gnome did that). Didn't wait for pally rez after 2nd wipe (didn't think they'd down him). Didn't heal myself in time during 3rd boss (too confused by "Stop DPS").
On average, the party(minus myself of course) was pulling around 1400 dps each.
Should I feel bad about us not making it? I was (I didn't check gear, but from the way they were talking) presumably the only one in mostly blues. I think, however, had I not been having to heal the mage and pally so much, and had the tank been there before, we would've made it...