in a merit party, if you're throwing up buffs "between mobs", something is pretty wrong. and yeah, losing /DRG is losing haste, which is compounded by the animation delay. it's really just not a good idea. better to have BRD or RDM or something be the one subbing /COR.
Seriously of all the stuff to nitpick about /COR, the animation delay for 1-2sec (I have 75 COR, so I've maybe rolled a couple times), is a pretty poor one.
/DRG has +10 att, jump, h.jump, +10 acc and 5% haste(minus what you would normal use there)
It also can shed hate if you are worried that your mage fell alseep.
These are valid points.
The roll delay......a poor arguement.
Best case for /cor: You only found one bard, which means you have 4 DD who are two-handers. You are an avg contributor to the total group. (25%)
Adding /COR samurai roll drops everyone from 6 hit WS to 5 hit WS. All two-handers get 50% of thier damage from WS in this grp (I know most SAM, WAR and DRG do, idk DRK). This should be an increase of about 8.33% (?) for the total grp. Losing all /DRG benefits might drop 20% of your total damage or 5% of the total group (no i didnt crunch the numbers exactly - not enough time at work, but its probably an overexaggeration if anything). O, and also you lose another 0.1% for the roll animation <<. So overall thats a win for /COR.
Poor case for /COR: You have a BRD and COR, you gear kicks ass and the rest of your party sucks and the the other DD have low WS to TP damage. You are in at 45% of the total damage. Again /COR bumps the grp up 8.33%, but droping 25% of 45% is now 11.25% of the total. Everyone in the party puts you on a Blist, beacause you /cor and lost nearly 3% of the exp they could have had. Shame on you for thinking outside the box.
Lastly, sometime you kill all the birds and sometimes the BRD slacks on pulling, so every once in a great while you have a sec or two btw mobs.
Bard #2/cor or rdm/cor sounds fine to me too as long as the dia, buffs, and heals are on point.