Long story short,if you kite my army and keep me at a distance well done you should win,but if i get you in melee(as a orc) i should have the upper hand.
And thats the point. The description of the orcs promis the best meleeunits ingame.
So Orc should have the strongest melee units as elven already have superior rangeunits.
Orcs already have weakes economics and strongholds and are supposed to be an offensive race ..
so they should have at least one advantage there ...
Now they are stuck at heavily armored elve units with more dmg while their superior archers cut your armys down ....