Anyone that thinks Mass Hold is the only viable tactic in Epics is just dead wrong.
It's the fastest way to kill things, yes. But Mass Suggestion/Symbol: Persuasion and ignoring both the charmed mobs and everything they are fighting works just as well. 3SP Resistable Dance neutralises any epic mob long enough to kill it at leisure, and Irresistable Dance can do the same. Even Hypnotism works (Hypno a mob, zerg past it), or Fascinate.
You can tell a mediocre caster by the fact that they flat-out refuse to run VON4 epic because their holds don't work there, or if they run it they pike. Decent casters are a powerhouse in that quest.
Noone really made any heavy use of Mass Hold in epics until the VON series was epic-ified. Hell, I led the server-first epic Devil Assault on Khyber and we did not use Mass Hold much at all (that was to conserve SP, now we do use Mass Hold more as casters are usually willing to drink a couple of mana pots to shave 10 minutes off the completion time).
I play to have fun too, which is why I run a LOT more Epics than I do Shrouds or TRs. Levelling a 36 point build really feels like a repetitive job. Running epics (other than the easiest ones) is different each time. Epics could be improved, but they are a hell of a lot more fun than beating down 15 12000hp portals that don't fight back, then surrounding a Pit Fiend, autoattacking and casting Mass Heals on cooldown, then getting a large bone for the trouble. (Part 2 can be entertaining at level)