As a long term Darkfall player I would like to throw in a point of view. One of the troubles in Darkfall is not the grieving pvp as much as a lack of pvp with meaning and to much of random pvp hunts with no meaning. There is nothing in the game mechanics that explictily prevents people from having clan warfare with meaning as instead of random pvp 'light' but there appears to also not be anything that encourages people to have more meaning behind their conflicts.

Solution? I dont know, but one thing is clear, if its 'open everything' and left for the community to form everything like Darkfall it will attract what I call the 'casual pvper' the ones that want 1vs1, grieiving and arenas.