I didn't like pve in warhammer but I loved the way that spontaneous world pvp worked, with more rewards for defending a castle than sieging it, there was usually a group your level attacking or defending a castle somewhere. Sadly at level 30 (I think I'm remembering levels correctly, might be 40) you lost the ability for everyone to speak in the pvp channel so that only guild leaders could start or coordinate raiding parties and it became a lot less fun.