Wailing Caverns is another starter dungeon instance located in the heart of the Barrens.
This dungeon might be the most hated in the entire game. Keep in mind, it's meant to be a starter instance, so you wouldn't think it would be too long or convoluted.
Take a mix of people who might be just learning how their characters work, mix it with the most boring aesthetics possible; a never-ending series of caves, make it about two hours long, and you have yourself this place. It is pretty wretched. As near as I can tell, the story involves rescuing a druid who wandered in here and was trapped in the Emerald Dream, which is explained in-game about as well as Poochie's home planet. For all intents and purposes, it is a parallel version of the real world, which non-playable characters sometimes find themselves in. Anyway, your mission is to save the druid, but the wild raptors and corrupted druids inside the caverns stand in your way.
When it comes time to wake him up, you have to protect another one of the druids while he completes the ceremony. However, a creature from the trapped druid's nightmare emerges...a giant murloc.