I LOVE dungeon crawling. having a few bosses in a dungeon you have to pass thru each with their own mechanics to learn and everyone in the group needing to learn, and everyone has their role in the party to follow or risk having the whole party wipe. THIS is why I play mmorpg’s 🙂
Having a rare world boss that need a huge raid party which consists of multiple parties is also fun and really brings the MMO part of a mmorpg into scope.
Usually not a fan of group pvp in open world, most of the time it means a group of 3-4 players running around killing solo players, it can however be fun in a set up planned event, like a guild vs guild siege scenerio