Siren Isle? Wth?

What in the heck are we supposed to be doing out there? I got the small story-line done a few repeatable quests, and slaying the same mobs in caves. Where are the familiar faces to fight, and where is the spooky stuff? I see no indication of these; only the same stuff over and over to no end. I went out there to fight those familiar faces and to check out the spooky stuff (sounds interesting), but the place is empty and void of meaning. I’m at a loss and am losing interest in the place.