screw wizards, I`m with the warriors all the way. why cast sissy spells and wear dresses when you can swing around a mace, bashing skulls in, and wear full plate armor. Equip your warrior with a spell reflection/absorbing shield and he eats your wizards for breakfast, and then some.
And to have a mini-example: When I still played WoW, Me and some friends went down some instances with warriors only, just for fun. We cleared quite a few too. Hence we had no need for sissy spellcasters on our team, we just killed our opponents before they could kill us, simple as that.