The hope is that a caster will root the mobs for you (stand on its toes, rooted mobs attack whoever is closest... was playing my ranger the other night and the war went AFK so I just pulled the mob on top of the war and rooted it so he could still tank while he was afk). Also monks and rogues have effective ways of ditching aggro. If the shaman is slowing early, you can taunt off that to give you a lead against any other melee.
If my group could get an AFK war to tank, there shouldn't be any problem having a warrior who is actually tanking to take the majority of the hits.
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