Part of that may be a lack of communication. I konw that I would be more than happy to remain in the doorway and let the rangers go at it (and the caster) if they tell me that they want to do that. Most of the time that we run into the middle is to get to the casters that have the AoEs and to try and get every mob in the room focused on us. (the melees, of which I am one).
I think that a lot of the problem (on both sides) is a lack of communication. The people that like to kite assume that the party will be better off if they do so. The people that prefer to melee think that the party is better off when they have aggro. Both methods can work. But neither will work when part of the group is trying to kite and the rest of the group is trying to stand still and fight.