My warrior hero also uses a 1H sword with shield, while my DK is a archer. To get enemies to attack my Hero, I tend to encumber my DK so that he walks slower, and is further away from me when I initially engage the enemy. My DK is then able to shoot arrows that inflict serious damage(200-300+), and avoid most area effect spells. Meanwhile, my hero's high ac, shield, and shield block skills allow him to fight several enemies at once without taking too much damage. So far, it's worked great for the 1st 3 acts, and I haven't had any problems in act 4 yet. As with anything, there's pros and cons to every fighting style. To each their own.
