I think this is probably the first mmo where you cant use the "its slow leveling as a tank/healer" argument as you have companions. I have leveled as a sword and board paladin and armsman in daoc, prot warrior in wow and also sword and board ironbreaker in war, they were slow! However on my juggernaut which is now lvl 42 i can adapt to any situation with a healing or dps companion. I would fall on the againsr duel spec side dof the fence because i thonk it just diminishes the decisions people take and makes everyone generic.