Mass Effect II is a sequel to Mass Effect one, following the story of Captain Shepard in his or her journey in saving the Galaxy from Reapers. Just after the fight against Saren, Shepard dies and drifts in open space. Being collected by Cerberus and the lead man, The Illusive Man, Shepard has to investigate attacks on human colonies around the Milky Way, and discover that now the Reapers using some new insectoid called the Collectors.
You can choose from different classes to play, for example, a Soldier, Adept or Vanguard. A cover system is the main mechanic in the fight, as you have to think about fighting your enemy strategically. Your talents have a global CDR, so choose wisely. With one little addition, now your weapon has a loaded magazine of bullets, and you can run out of ammo if not using your weapon properly.
BioWare sticks to the tradition of dialogue and reputation system, as your actions still affect your position in the world. If you act like a hero and help everyone you meet, people will like you and your reputation will be Paragon. Do the exact opposite and a Renegade. Whom will you be?