Succesfully defeated Raven with a (mostly) random pick-up party. Took a few attempts but was not at all hard.

However, participants WILL need to be good at their job. (Good does not mean tripple melded DL gear... you don't even need double meld). Know how to stand where told. Know how to cycle through your skills. Know how to conserve MP.

If someone is having a lot of trouble beating this thing, then chances are that it is due to the skill level of the individuals, and nothing more.