Island Expeditions didn't take off for me, but PvP islands are a realm in which I am lord and tyrant and I will ruin your chances at getting that pvp essences stay down there alliance I FREAKING OWN YOU But yeah islands didn't really work for me sorry blizz
I like that we can get unique mounts, items that we normally couldn't. But my biggest beef with it is it's a rush fest to gather things. When I would much rather explore the island or let it tell a story like MoP's scenarios did.