I create my party with each character doing a diferent thing like:
Berserker(For fight and leadership), Rogue(For disarming and bows), Cleric(Priest spells and first aid) and a Sorcerer(Mage spells and potions)
or
Archer(Range attacks), Rebel(Disarming and lore), Shaman(Fight, priest spells) and a Hedge Wizard(Both spells and potions)