Not in total and not by area. A level 6 Minasli Mage deals 380-460 damage with a second-level ice spell, and several skills are invested in dark magic (for mana regeneration in battle). So, 400 is still not the maximum damage a "good" mage can deal.
However, an Orc will probably deal less, but compared to a mage without specialization, it's more or less comparable. It doesn't spend mana and can gain some warrior skills and stats. Although, in general... The ability of mages to cast mass Stone Skin for a plus one million to defense, or mass Storm Arrows for a plus one million to ranged attack and shooting without penalty, or something similar... All of this clearly undermines the position of warriors.
