Mass Effect 3: Citadel - Single Player DLC
Great little touch
The is probably the toughest of the DLCs for ME3. Getting this DLC gets you one new mission, A new pistol type (high damage low capacity type), additional dialogue options with team members, and opens up a new Citadel section.
The mission length is about as long as the Omega DLC. The enemies are not Reaper and not Cerberus but a rouge element. Completing this mission does get you a few war assets. After the mission you get to throw a one time party and dialogue with team members. The Citadel sections that opens up allows you to play mini games like at the casino, arcade, or arena.
They spent a lot of attention to this DLC and it shows.