Are they really melee fights, though? Big spells like Fireball represent a lot of effort--you can normally cast only one such spell per turn. Besides, the enemy gets no opportunity to counterattack: The mage is standing two tiles over (does anyone know exactly how far away this is?) and blowing up their city from a safe distance. I've always considered adepts/mages/archmages to have a variety of lesser spells at their disposal which they use in a more traditional magical combat sense--Entropy mana to make your foes wilt and die before you, Fire mana to launch bursts of flame at people, etc.