Just finished a dual lonewolf game with a ranger and a wizard, things very midly hard at the beginning, but became easy once we got 3 sources spells. It was fun however, maybe more than 2 physical character, as it needed some strategy (archer targetting mages, wizard going for the warriors for instance), the wizard often used chicken, archer could chloroform or charm/stun/freeze with arrows.
Very feasible, not very difficult because of lonewolf, but quite fun.