You're thinking too much L2
Starting thinking Aion.
So I repeat, hopefully NCSoft thinks about the skills this time and it should equal out. Something like a hero is worth x people would be ok, not a hero is worth 10 people.
If you want to discuss the mechanics of L2, head over to the arcade and ill discuss with you about how 5 heroes can beat 10 heroes.
Any which way, I think that there aren't enough details about the hero system for Aion and I don't even know if it is something that will be implemented as part of the go live.
I think its pretty low on their list of priorities so far, as it has only come up twice that I have read about.