I almost promise you were called an Epic Failure for the reason you didn't have your epic done.
the mythical effects that you get form taking your heroic version and doing epic repercussions are in many cases for support/dps classes darn near vital in raids...and Very, VERY nice in groups.
example being my own....as a paladin my myth buff gives me basically 10% damage reduction from the idea that 10% of every hit I take is restored as a heal. makes it nicer for the healing classes.
I dunno what Troubies get. I know the Dirge one was more 'raid' oriented, as it makes CoB raidwide as the major effect, but I beleive it also gave the dirge a nice bump in dps.
the Mystic Spirit Tap was mana replenishment on every hit for the group.
see how nice some of these abilities are?
Illy gets thier pet for no concentration.
necros/conjys got a supped up tank pet (meh for groups, not bad for solo times)
Warlocks got thier green aes turned into single target nukes with a decent jump in the damage that can be toggled.
And like has been said, doing your epic is pretty much entirely soloable at 90/92. about the only thing you'd need help with is some of the last parts of Epic Repercussions.