Massing one unit type is high risk high reward. Someone once tried to attack me with an army of 50 archers and one dragon. He would have devastated me had I had mainly archers/heavy infantry. Unfortunately for him, my army consisted of mainly cavalry. One swift cavalry charge = 50 dead archers.
Ogres are powerful, but they do have counters. Pikes are the obvious one, but archers mow them down pretty quickly too as long as you have a screen of pikes/heavy infantry in front of them to slow charging units down. If you're playing humans, crossbowman work wonders.
Regarding the hero thing, like was mentioned before, if you only kill 2 units in that army during the entire battle, your opponent loses 60 wealth. Even if the rest of your army gets decimated, economic victory is still yours.
--In Game: Erebus
Last edited by Ghost : 06-05-2012 at 11:39 AM.