Borderlands 2: Captain Scarlett and Her Pirate's Booty
The final mission ends somewhat abruptly (as in, the ending event seems slightly unfinished), but don't take this DLC campaign's brevity as a sign of laziness -- there are a ton of side-missions in here that I've yet to scratch the surface of. This being yet another way that Captain Scarlett is really more of the same Borderlands 2 experience, and that definitely isn't a bad thing at all.
Progress: Opened the desert vault