I took a hint from Tobold's comment on his own post about the Invasion epics and took my lv62 (I checked...) Tauren Druid off from dusting and -after a while of tweaking and addoning- took off to hunt some Lich King Minions.
Only to notice that the event is steered only to lv70's and guilds in which lv70's take care to equip their lv65+ up and rising members.
The mobs are all lv69-lv71, the highest being the rares. And I got pwnd, heavily. Ok, I could scratch their skin a bit, and when I pulled accidentally one, I just ran amidst of the other players and ... scored a kill, as they finished the mob! This happened twice, because I felt it was cheating, big time.
Then again, taking into account the events progress, it might not have been. Every minion which gets killed damages the crystal, the main focus of the event, and when it's damaged low enough the 'repairmen' get summoned. So in a way the party clearing the event area benefits from all minion they kill. And to lv70 only the Necrotic Runes matter, not the exp the mobs give.
Whatever the case, I would have preferred to see some variation in the mobs, just for the sake of making this event available for wider range of people. Even the way that if the 'landing zone', the area around the crystal, is unattacked or just appeared, the initial mobs would be of lower level to accomodate us not-so-well-versed in the game, and their stats would get better the more they are harvested. At this point of the game, it doesn't matter a bit how difficult the mobs are thought to be, as the toons harvesting them have most probably pretty high end gear to compensate. I mean, I saw the palladins, mages and hunters cut the minions down faster than my druid could say cheese. And that's pretty fast.
My only hope is that the next stage of the event is more of a WORLD event like the zombie infection. People in my Alliance levelling guild didn't even know about the Necropolises except the one outside Stormwind nor about the invasion even. They had been wondering what the skulls meant in their maps.
That's the kind of guild my Alliance toons are, and I like to help them to learn the game, the lore and the guild. And for them I wish -mainly- that these events were made applicable for all players, not only for the burned out lv70 raid machines looking for change. Damn, they have the dailies already! Blizz could make them more varied!