That falls right into the MMO raid dilemma though. You want to keep it challenging enough so that there's still a challenge for overgeared players (so straight up DPS checks/EH checks are out of the question), and yet too many instant kill mechanics require perfect placement in a genre where perfect precision is a crap shoot due to latency and a myriad of other problems falling outside the direct control of the player.
I don't think any game has ever found a decent enough balance about it, too.
I don't think any game has ever found a decent enough balance about it, too.