Dont make the marauder weaker <.< thats our main backbone unit. desert swamp or forest. you'll need em for when you need to defend your cities. those goblins are enmssed and mot exactly suitable for the walls. Marauders are pretty balanced as it is atm. you'd just need to generally buff the other units (exludeing ogre, ogre seems balanced from my experience). Wargs seems great too. while very unefficent in combat, their howl ability is superb if used in waves.
"Orks is never beaten in battle, if we wins we wins, if we die we die so it don't count as beat, an' if we runs for it we don't die neither, so we can always come back for another go!"