The Mass Effect 2 DLC Overlord can be described with one word: Perfection. It embraces the very best of Bioware’s flagship series and there is honestly not one single worthwhile complaint which can be made about it. In terms of immersion, cinematic style, gameplay and story it is almost impossible to find a mission which tops this DLC. The conclusion feels even more emotional than the attack on the Collector Base which served as the finale to the second game, and the weight of the moral choice made in Overlord resonates much more strongly than the one there.
The DLC has you tracking down a Cerberus base which has recently gone silent and was conducting a number of experiments involving combating the Geth. Things have gone very bad there and in a suitably epic fashion it’s quickly revealed that your failure to stop what was created there will result in an apocalyptic catastrophe. There’s really nothing more which can be said without spoiling some of the best parts of Overlord. What is worth noting is that it’s all but completely unrelated to the rest of Mass Effect 2’s storyline which allows it to focus on telling its own tale much more effectively.
While the core gameplay remains the same, there are many new mechanics added. These are small gimmicks which are introduced and abandoned in extremely quick succession and help the DLC to constantly feel very active. One good example of this is where you fight a Geth turret and are frantically forced to repeatedly trick it into blasting its own shield generators so you can take it down.
The Hammerhead makes its return from the Firewalker DLC and is used as your primary method of travel throughout Overlord and it makes very good use of it. As you traverse the grassy terrain you are constantly fighting hacked turrets so there’s plenty of combat to be found there and as with Firewalker the vehicle sections are used to include some platforming amongst the frequent gunfights.