Since I have missed all of the attunement chat, I'll jump in on this.
Some of the mechanics are the world bosses are quite interesting; however, because there is very few max level ones, they end up just being tedious (along with the shitty respawn rate). While you are leveling, they are 'fun' but extremely unrewarding (usually leaving you with nothing), but XP is alright. If you attack them at 50, they are a nightmare. For some reason, they thought it would be a good idea to scale your damage down but not your other stats (armor/HP). On top of that, they didn't increase the world bosses' damage to scale with you. So at 50, the hardest part of world bosses is finding them and get them to respawn. The typical fight looks like this: find mob, stand still and attack until it dies. Hell, it is shit like that that makes you miss auto-attack -_-