The effects of attack power on mobs in raid instances isn't the same as the effect it has on players; I'd give some exact numbers, but the exact effect seems to vary from mob to mob. For this same reason Demoralizing Shout is also worth using.

Nevertheless, it's a good buff, just not in circumstances where either damage gets multiplied or physical spike damage kills your MT (Broodlord, Maexxna come to mind).

I'll admit I don't know how this adds up in an enrage phase, but that can be easily avoided by the lock doing CoR simply switching to another curse. If the enrage phase is a problem for you, you could always switch to CoW =P. I used to do this on Chromaggus the first couple times, since our MT tended to die at 1% each time. We usually DI him at 1% nowadays to prevent that though.

But seriously, we're nowhere near a leet guild, and we use CoR on anything in MC/ZG/AQ20, and all of BWL apart from broodlord, as well as everything up to Huhuran in AQ40. None of our tanks really notice much difference.

If your warlocks insist on being strongheaded, ask them to try it out on farm-status bosses, and talk to your tanks/healers about it, see if they notice anything.

So now someone else just gets to die instead? ... I'd tell your healers to learn to play.

My suggestion would be simply to do the fights without Curse of Recklessness to begin with, then when you have a good picture of the fight and the damage from the boss then talk to your healers. Ask them if they think it would be okay with CoR on the boss and then just take it from there. There's no need to go into a fight with CoR on. Of course avoid fights with spiked physical damage, generally, although there are exceptions like Patchwerk.

Speaking of CoR, how about Maexxna? Obviously, having it up during Web Spray is unnecessary and dumb--do people find it safe to use at all? Are you confident about saving that Warlock from Web Wrap in time for him to get it off, or do you abandon it altogether?

Hasnt this been hashed out enough?

EJ Forums secret: Nothing can be hashed out enough, until at least 5 spreadsheats have been created.

http://forums.elitistjerks.com/viewtopic.php?id=7028

Yes, this subject was discussed some time ago. This is only the second dedicated thread on the subject though as far as I know.

Me to warlocks about two months before Naxx - Throw CoR on everything please. Ignore everyone who says it's doing too much damage.
Me to warlocks about 3 weeks after Naxx - Wait, you're throwing CoR on Maex?

Our first 2-3 kills on her were done with CoR up almost the entire fight. It's doable, but not exactly optimal. We've stopped doing CoR btw.

It adds attack power, which equates to DPS and hence gives a different bonus on a per swing basis (something that hits every 0.5 seconds gets less of a bonus per attack than something that hits every 4 seconds), but over time it'll give the same damage bonus.

The difference is 90 attack power for a player gives a certain DPS, whereas 90 attack power for a mob gives a completely different DPS bonus. The DPS bonus may even be different between mobs.

And then there's the damage bonus multiplier abilities like Broodlord Lashlayer's mortal strike. COR will result in a MUCH more visible effect on that attack than his normal melee attack.

is this true? So CoR doesn't add to HS at all?

Well, I believe it only really affects abilities that use the regular hit damage to figure out the damage the ability will do. Hateful strike does not have a 1400% damage multiplier. It is just straight damage. So no affect.

Other abilities that are tied in with regular damage hits will see an increase in damage with CoR.

I believe there was a thread seeing the affect of attack power reduction on mobs. It seems taht you can only reduce damage from regular hits by 30% or so with attack power debuffs. And one imporved demo shout gets you to about 25%. I imagine you could probably extrapolate backwards without too much error. It was an interesting thread and I wish it had been taken further.