Make no mistake, Big Game Hunt is still Borderlands 2. Combat is still satisfying, as is finding that next gear upgrade. Anyone who found the core gameplay enjoyable before will most likely find it enjoyable here, and a new raid boss offers completionists yet another feather to put in their cap. But in terms of story, dialogue, and encounter design, this add-on pales in comparison to the rest of Borderlands 2. It's like the worst episode of a show you love -- it isn't quite bad, but knowing how good it can be makes it hard to get excited over.
PS: Increase the level cap already!