For the game, BioWare changed several gameplay elements and further emphasized third-person shooter aspects, including limi and regenerable health. In contrast to the exclusive focus on the main story of the original Mass Effect, the developers opted to create a plot where optional missions had as much intensity as the main mission. Mass Effect composer Jack Wall returned to compose Mass Effect 2's music, aiming for a darker and more mature sound to match the game's mood. Mass Effect 2 also supports a variety of downloadable content packs, ranging from single in-game character outfits to entirely new plot-related missions. Notable packs include Kasumi – Stolen Memory, Overlord, Lair of the Shadow Broker, and Arrival.
Released to critical acclaim, Mass Effect 2 was praised for its presentation and cinematography, diverse and complex characters, and improved combat over its predecessor. Some critics, however, expressed concerns about the game's simplified role-playing mechanics. The game received numerous year-end awards, including Game of the Year at the 14th Annual Interactive Achievement Awards and Best Game at the 2011 British Academy of Film and Television Arts Awards. Mass Effect 2 is considered a significant improvement over its predecessor and one of the greatest video games of all time. A sequel, Mass Effect 3, was released in 2012. In 2021, Mass Effect 2 was remastered as part of the Mass Effect Legendary Edition.